This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahih Fazail-e-Amaal.
Allah Almighty says:
﴿قُل لِّلْمُؤْمِنِينَ يَغُضُّوا مِنْ أَبْصَارِهِمْ وَيَحْفَظُوا فُرُوجَهُمْ ۚ ذَٰلِكَ أَزْكَىٰ لَهُمْ ۗ إِنَّ اللَّهَ خَبِيرٌ بِمَا يَصْنَعُونَ﴾
"O Prophet! Tell the believing men to lower their gaze and guard their private parts; that is purer for them. Indeed, Allah is Acquainted with what they do."
Reference: (24-An-Nur:30)
Dr. Luqman Salafi, may Allah preserve him, writes:
"For the purification and sanctity of the souls of Muslims and to close the doors of obscenity and immorality, Allah Almighty has commanded to lower the gaze and not to look at non-mahram and unrelated women, and if by chance the gaze falls upon a non-mahram woman, then immediately turn the eyes away. And guard your private parts, neither commit fornication nor expose your private parts to anyone for whom it is forbidden to look. By following these two commands, the soul of a Muslim remains pure. Some commentators have written that protecting the gaze and heart is more effective for the purity of the soul than performing voluntary prayers."
Reference: (Taseer ur-Rahman: 2/1001)
﴿وَقُل لِّلْمُؤْمِنَاتِ يَغْضُضْنَ مِنْ أَبْصَارِهِنَّ وَيَحْفَظْنَ فُرُوجَهُنَّ وَلَا يُبْدِينَ زِينَتَهُنَّ إِلَّا مَا ظَهَرَ مِنْهَا ۖ وَلْيَضْرِبْنَ بِخُمُرِهِنَّ عَلَىٰ جُيُوبِهِنَّ ۖ وَلَا يُبْدِينَ زِينَتَهُنَّ إِلَّا لِبُعُولَتِهِنَّ أَوْ آبَائِهِنَّ أَوْ آبَاءِ بُعُولَتِهِنَّ أَوْ أَبْنَائِهِنَّ أَوْ أَبْنَاءِ بُعُولَتِهِنَّ أَوْ إِخْوَانِهِنَّ أَوْ بَنِي إِخْوَانِهِنَّ أَوْ بَنِي أَخَوَاتِهِنَّ أَوْ نِسَائِهِنَّ أَوْ مَا مَلَكَتْ أَيْمَانُهُنَّ أَوِ التَّابِعِينَ غَيْرِ أُولِي الْإِرْبَةِ مِنَ الرِّجَالِ أَوِ الطِّفْلِ الَّذِينَ لَمْ يَظْهَرُوا عَلَىٰ عَوْرَاتِ النِّسَاءِ ۖ وَلَا يَضْرِبْنَ بِأَرْجُلِهِنَّ لِيُعْلَمَ مَا يُخْفِينَ مِن زِينَتِهِنَّ ۚ وَتُوبُوا إِلَى اللَّهِ جَمِيعًا أَيُّهَ الْمُؤْمِنُونَ لَعَلَّكُمْ تُفْلِحُونَ﴾
"And tell the believing women to lower their gaze and guard their private parts and not expose their adornment except that which [necessarily] appears thereof and to wrap their headcovers over their chests and not expose their adornment except to their husbands, their fathers, their husbands' fathers, their sons, their husbands' sons, their brothers, their brothers' sons, their sisters' sons, their women, those whom their right hands possess, or those male attendants having no physical desire, or children who are not yet aware of the private aspects of women. And let them not stamp their feet to make known what they conceal of their adornment. And turn to Allah in repentance, all of you, O believers, that you might succeed."
Reference: (24-An-Nur:31)
In this sacred verse, Allah Almighty has laid down the commands of hijab. And at the end, He states that your success lies in turning to Allah in repentance. In other words, following Allah's commands and abstaining from His prohibitions is the secret of your success.
﴿يَا بَنِي آدَمَ قَدْ أَنزَلْنَا عَلَيْكُمْ لِبَاسًا يُوَارِي سَوْآتِكُمْ وَرِيشًا ۖ وَلِبَاسُ التَّقْوَىٰ ذَٰلِكَ خَيْرٌ ۚ ذَٰلِكَ مِنْ آيَاتِ اللَّهِ لَعَلَّهُمْ يَذَّكَّرُونَ﴾
"O children of Adam, We have bestowed upon you clothing to conceal your private parts and as adornment. But the clothing of righteousness - that is best. That is from the signs of Allah that perhaps they will remember."
Reference: (7-Al-A'raf:26)
Allah Almighty has given man a place to live on earth and various things to eat and drink, and after the garment of Paradise was taken away, He gave clothing by which he covers his private parts and adopts adornment. The demand of these blessings is that he believes in Allah, repents from polytheism and sins, and walks on the path of piety. That is why Allah Almighty then said that if a person wears the garment of piety, meaning adopts a life of faith and righteous deeds, and in every condition the fear of Allah prevails in his heart and mind, then that is better for him in every way."
Reference: (Taseer ur-Rahman: 1/460)
﴿يَا أَيُّهَا النَّبِيُّ قُل لِّأَزْوَاجِكَ وَبَنَاتِكَ وَنِسَاءِ الْمُؤْمِنِينَ يُدْنِينَ عَلَيْهِنَّ مِن جَلَابِيبِهِنَّ ۚ ذَٰلِكَ أَدْنَىٰ أَن يُعْرَفْنَ فَلَا يُؤْذَيْنَ ۗ وَكَانَ اللَّهُ غَفُورًا رَّحِيمًا﴾
"O Prophet! Tell your wives and your daughters and the women of the believers to bring down over themselves [part] of their outer garments. That is more suitable that they will be known and not be abused. And ever is Allah Forgiving and Merciful."
Reference: (33-Al-Ahzab:59)
﴿وَقَرْنَ فِي بُيُوتِكُنَّ وَلَا تَبَرَّجْنَ تَبَرُّجَ الْجَاهِلِيَّةِ الْأُولَىٰ ۖ وَأَقِمْنَ الصَّلَاةَ وَآتِينَ الزَّكَاةَ وَأَطِعْنَ اللَّهَ وَرَسُولَهُ ۚ إِنَّمَا يُرِيدُ اللَّهُ لِيُذْهِبَ عَنكُمُ الرِّجْسَ أَهْلَ الْبَيْتِ وَيُطَهِّرَكُمْ تَطْهِيرًا﴾
"And abide in your houses and do not display yourselves as [was] the display of the former times of ignorance. And establish prayer and give zakah and obey Allah and His Messenger. Allah intends only to remove from you the impurity [of sin], O people of the [Prophet's] household, and to purify you with [extensive] purification."
Reference: (33-Al-Ahzab:33)
From all these sacred verses, the importance of hijab becomes clear that hijab is the honor and dignity of a woman, a protector from the evil eyes of people. Undoubtedly, a woman who goes out adorned will become the center of attention. She will be subject to gossip and many will commit further harassment with her, whereas in hijab she remains safe from all these things because in that state she will not become the center of attention.
Verses:
"In the race of shamelessness, how many have participated,
How many have made themselves a spectacle,
Why has the dust of the desert of disbelief settled on faces,
Why has this storm come in the garden of the path of vision."