O you who believe, let those whom your right hands possess and those of you who have not attained to puberty ask permission of you three times: Before the morning prayer, and when you putt off your clothes for the heat of noon, and after the prayer of night. These are three times of privacy for you; besides these it is no sin for you nor for them -- some of you go round about (waiting) upon others. Thus does Allah make clear to you the messages. And Allah is Knowing, Wise.