Short Answer: No. Nothing explicit, but it’s implied. Women were already covering their heads at that time, so when God commanded them to “draw their veils over their bosoms“, it’s assumed that women were covering their hair (with what is translated here as “veils”). Also, Muslims follow the Quran AND the confirmed sunnah of Prophet Muhammad, delivered to us via authenticated ahadith. We cannot refuse to follow the sunnah and demand proof only from the Quran.
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Prophet Muhammad, The Living Example
During the period when the Quran was revealed to the Prophet Muhammad (peace and blessings be upon him), some of its verses needed explanation.
This explanation came from the Sunnah and hadiths (the Prophet’s actions and words).
Ritual prayers (salah) are a very clear example of this explanation.
In many verses of the Quran, Allah Almighty orders us to pray to Him without mentioning the way we are to perform that prayer, and the Sunnah has given the Muslims the manner in which to perform salah.
Specific Verses Regarding Hijab
A similar thing happened with hijab.
Allah Almighty says what means:
Tell the believing men to lower their gaze and be modest. That is purer for them. Lo! Allah is Aware of what they do. And tell the believing women to lower their gaze and be modest, and to display of their adornment only that which is apparent, and to draw their veils over their bosoms, and not to reveal their adornment save to their own husbands or fathers or husbands fathers, or their sons or their husbands’ sons, or their brothers or their brothers’ sons or sisters sons, or their women, or their slaves, or male attendants who lack vigor, or children who know naught of women’s nakedness. And let them not stamp their feet so as to reveal what they hide of their adornment. And turn unto Allah together, O believers, in order that ye may succeed. (Quran 24:30-31)
Sister AElfwine commented on these two verses clearly in her answer to the question, I Get So Many Questions About Hijab:
These verses tell us that our Islamic dress is not just a matter of covering the head alone, but also of covering the bosom, which is attractive to men, and of lowering the gaze and walking in a way that does not attract attention. Note that the order to lower the gaze was addressed first to men […]
Islam Came to Liberate Women
Islam from the very beginning to took care of the woman.
Islam came to give her rights that guaranteed her dignity and freedom.
She was underestimated and looked at as inferior to man, but Islam said that she’s not.
She is spiritually equal to man.
She was exposed to harassment from many men who were not blamed by their society for their unjust way of dealing with her, and Islam came to save her.
The command came right from Allah Almighty to her to protect her beauty from those who do not care and who are not trustworthy, and also to stand out from the crowd and be known as a believer.
Allah Almighty says what means:
O Prophet! say to your wives and your daughters and the women of the believers that they let down upon them their over-garments; this will be more proper, that they may be known, and thus they will not be given trouble; and Allah is Forgiving, Merciful. (Quran 33:59)
At the time when this clear command of wearing the hijab was revealed, all the Muslimahs covered their heads, without asking why, because they were believers.
They were aiming to obey Allah’s regulations, knowing for sure that they were for their best.
So, if your friends are, as you said, of a good knowledge of Islam, they should sense the great effect of hijab and lower the gaze for both men and women.
Thank you again for your trust, and please keep in touch.
(From AboutIslam’s archives)