The word "Hijab"—which literally means screening or, better said, protecting something from the view of others—refers, in the Islamic context, to a kind of attire or a piece of clothing that covers a woman's body and hair. 

Different Aspects of Hijab in Islam

Hijab Elevated the Status of Women

Not long before the advent of Islam were women regarded as objects of men's lust; female children were buried alive. To be brief, women were subject to physical exploitation and degradation. Islam, however, elevated women's status in society and granted them equitable treatment.

This idea is underscored many times in the Quran: “And whoever does righteous deeds, whether male or female, should he be faithful such shall enter paradise and they will not be wronged] so much as [the speck on a date-stone” (4: 124); or, “Whoever commits a misdeed shall not be requited except with its like, but whoever acts righteously, whether male or female, should he be faithful such shall enter paradise, provided therein without any reckoning” (40: 40). There are copious other examples in this regard.   

Hijab Includes Men as Well

The fact that Hijab (in Islam) is not exclusively for women is equally important and worthy of attention; men also should be heedful of their clothing and their behavior. As a matter of fact, the Holy Quran first speaks of the word 'Hijab' about men and then women: “[Prophet], Tell the faithful men to cast down their looks and to guard their private parts. That is more decent for them. Allah is indeed well aware of what they do. And tell the faithful women to cast down their looks and to guard their private parts, and not to display their charms, except for what is outward, and let them draw their scarfs over their bosoms, and not display their charms except to their husbands, or their fathers, or their husband's fathers, or their sons, or their husband's sons, or their brothers, or their brothers" sons, or their sisters" sons, or their women, or their slave girls, or male dependants lacking [sexual] desire, or children uninitiated to women's parts. And let them not thump their feet to make known their hidden ornaments. Rally to Allah in repentance, O faithful, so that you may be felicitous” (24: 30-31).

Hijab Secures the Marriage

One out of the many benefits of the Hijab is to preserve and secure the stability of marriage, but how? Dressing modestly reduces extramarital sexual tensions between men and women.

Hijab, in essence, obliterates the ill thoughts of sick minds. In social interactions also Hijab does urges men and women to focus on the personality of each other, to build their relationship upon respect, virtue, and decency. In this way, they protect and propagate chastity and morality in society.

There are many great examples of chaste and pious women in the history of Islam who have tremendously contributed to the advancement of Islam and humanity in general.

Hijab Makes You Stronger

As a key Islamic value, Hijab is consistent with human nature. Men and women are by nature in favor of maintaining their dignity and self-esteem, and Hijab paves this way; it gives them an inner strength and empowers them to tell the world their decency and virtue cannot be compromised. The result is inner peace.

Hijab and Society

Therefore, from the teachings of the Quran, we come to realize that Hijab is the best principle (or code of conduct, if you will) that guarantees a better condition for male-female interactions in society because it keeps rampant desires on a tight leash. On a larger scale, observation of the Hijab prevents the society from falling into corruption and degeneracy.

We also realized that Hijab is not merely limited to the physical covering of the head and body; in fact, the physical Hijab must be accompanied by the Hijab of the heart and the mind.

Amidst the hustle and bustle of everyday life—with its common pitfalls and concealed traps—Hijab is truly a liberation beyond measure; it frees us from the slavish imitation of pseudo-liberal fashions that appear by day and vanish by night. It is a shield that protects our honor and helps us focus more and more on our superior goals.

The first days of Islam were very difficult days for the Prophet (PBUH&HP) because he did not have many followers and the infidels could conspire for the Prophet (PBUH&HP) more easily. They even attacked his house to assassinate the Prophet (PBUH&HP), but thanks to Allah, this conspiracy was in vain. But in these difficult days, the Prophet (PBUH&HP) had very valuable companions with him, one of these precious followers was the wife of the Prophet, Lady Khadijah (AS). Now we want to know more about the Prophet's wife and her services to Islam and Muslim women.

A short identity of Lady Khadijah (AS)

Lady Khadijah (AS) was from the Quraysh tribe. Her father was Khuwaylid and her mother was Fatima, daughter of Zaydeh, both of whom were among the most rooted and noble Arab families in the Hejaz. Khuwaylid was the eldest of his tribe during the pre-Islamic period. Before the advent of Islam, Khadijah was considered one of the most prominent Quraysh women, so much so that she was called by the Lady of Quraysh women.
Although she was a beautiful and wealthy woman and had a lot of suitors, she did not accept them and started a business with the big amount of money she had. Until Prophet’s uncle asked his nephew to work for Khadijah like his other relatives, and he went to the Sham business on his behalf, and so it was continued. The decency of Muhammad (PBUH&HP) and his talent, merit, distinguished personality, and reputation for fiduciary duty made him famous in particular and in general that he was called "Muhammad Amin" *. This news and reports made Khadijah fascinated by her lineage, merit, character, and liking. 

The first Muslim woman

Lady Khadijah (AS) was the first Muslim woman in promoting Islamic culture and as a role model of a Muslim woman has played a great role and many women have learned lessons from her practical training. She was so faithful that even the Prophet (PBUH&HP) said this about her in various narrations, we will read some of them to know more about her great role and practical lessons:

1)    The best women in the world are Khadijah and Maryam, the daughter of Imran (1)

2)    One day, the Messenger of God (PBUH&HP) drew four lines. Then he asked: Do you know what these lines are? People said: God and His Messenger are more knowledgeable. The Prophet (PBUH&HP) said: The best women of Paradise are Maryam, the daughter of Imran, Khadijah, the daughter of Khuwaylid, and Fatimah, the daughter of Muhammad (peace be upon her), and Asiya, the wife of Pharaoh. (2)

Lady Khadijah (AS) Services to Islam

In 24 years of living together with the Holy Prophet of Islam (PBUH&HP), Khadijah performed many services for the religion of Islam. The financial, spiritual, and emotional support of the Prophet (PBUH&HP), the acknowledgment of the Prophet in a time when no one approved of him, and his help against the persecution of the polytheists are some of these valuable services. After marrying the Prophet (PBUH&HP), Khadijah gave her property to him so that he could spend it however he wanted. The Holy Prophet of Islam says in this regard: "No wealth was as useful to me as the wealth of Khadijah."(3)

Khadijah, this noble lady not only believed in the message of the Prophet from the bottom of her heart but also helped him in the face of hardships and denials of polytheists and ill-wishers. While she was alive, she did not allow the persecution of the polytheists to be severe on the Messenger of Allah (PBUH&HP). When the Messenger of Allah (PBUH&HP) came home with a load of calamity and sorrow, Khadijah comforted him and removed the worry from his mind. The property of Khadijah was used as a suitable tool in the service of Islam and its development from the very beginning. Interestingly, the last part of Khadijah’s property was spent by Imam Ali (AS) during his emigration trip to Medina. Most Muslims traveled with Khadija's property. The last of them was a caravan led by Imam Ali (AS). (4)

She was also the mother of Fatima (AS), from whom the generation of Imams was born. Imam Sadigh (AS) said: "When Khadijah (AS) chose the Holy Prophet (PBUH&HP) as her husband, the women of Mecca turned away from her because of enmity. Not only did they not greet Khadijah; they even prevented other women from visiting her. In this way, a strange terror overwhelmed Khadijah. 

Of course, she was more afraid of the Prophet (PBUH&HP) to be harmed than herself. When Khadijah became pregnant with Fatima, Fatima spoke to her in her mother's womb and advised her to be patient, but Khadijah kept this secret from the Prophet until one day she entered and heard that Khadijah was talking with someone. He looked around; but he did not see anyone, he asked: O Khadijah! Who are you talking to? Khadijah, in response, told that she was talking to the child she had in her womb, Prophet (PBUH&HP) replied: “Gabriel informed that this is a girl child. She and her descendants are pure, blessed, and Allah will create my descendants from him. From his generation are born the Imams of the religion and the Almighty, after breaking the revelation, makes them his successors on earth.” (5)

Conclusion:

The position and role of lady Khadijah (AS) in the most difficult period of the history of Islam this affair is common knowledge. she played an important role in establishing and spreading Islam during the Besat** period with her material and spiritual support of the Holy Prophet (PBUH). She is a role model for men and women in society because she raised many human values and perfections inside herself. She gave all his wealth, economic facilities, and existence in the way of satisfaction of Allah and also with the spiritual, psychological, and social support for her husband, Prophet (PBUH), in promoting Islam and advancing its goals, thus making his name as a real and true model for a Muslim woman. She died in the tenth year of the Besat and shortly after the death of the Prophet’s uncle, Abu Talib (AS). Muslim women can learn from the practical lessons of lady Khadija (AS) throughout the history of Islam to be behind their husbands in any case and not to withhold any support from him.

References:

1. Al Umdah Ibn Tariq (page 405)
2. Sirat Ibn Hisham (first Volume - Page 168)
3. Encyclopedia of Shia (second volume – page 47)
4. Encyclopedia of Shia (second volume – page 49)
5. Encyclopedia of Shia (third volume – page 46)

* Amin means a trustee and someone who is trusted to keep the treasure of others while he does not betray or abuse the trust others gave him.
** Besat refers to the election of Prophet Mohammad (PBUHHP) as a prophet and the beginning of his mission