An-Nur 24:58

Ya ayyuha allatheena amanooliyasta/thinkumu allatheena malakat aymanukumwallatheena lam yablughoo alhuluma minkumthalatha marratin min qabli salatialfajri waheena tadaAAoona thiyabakum mina aththaheeratiwamin baAAdi salati alAAisha-i thalathuAAawratin lakum laysa AAalaykum wala AAalayhim junahunbaAAdahunna tawwafoona AAalaykum baAAdukumAAala baAAdin kathalika yubayyinu Allahulakumu al-ayati wallahu AAaleemun hakeem

O you who have believed, let those whom your right hands possess and those who have not [yet] reached puberty among you ask permission of you [before entering] at three times: before the dawn prayer and when you put aside your clothing [for rest] at noon and after the night prayer. [These are] three times of privacy for you. There is no blame upon you nor upon them beyond these [periods], for they continually circulate among you - some of you, among others. Thus does Allāh make clear to you the verses [i.e., His ordinances]; and Allāh is Knowing and Wise.

O you who believe, the slaves owned by you, and those of you who have not reached puberty, must seek your permission (to see you) at three times: before the prayer of Fajr, and when you take off your clothes at noon, and after the prayer of ‘Ishā’. These are three times of privacy for you. There is no harm, neither to you nor to them, after these (three times). They are your frequent visitors, as some of you are (frequent visitors) of the others. This is how Allah explains the verses to you. Allah is All-Knowing, All-Wise.