The author—may Allah have mercy on him—cites two verses from the Book of Allah.

The first—already discussed earlier—is the Almighty’s saying, “O you who believe, do not enter houses other than your own until you have sought permission.” We explained that the word istiʾnās here means either that you actually ask leave to enter, or that you possess certain knowledge that your host is ready to receive you. Take, for example, a situation in which someone makes an appointment with you and says, “Come to me after the ẓuhr prayer.” If, on arrival, you find the door open, that is permission. In such a case you need not request entry, for the homeowner has already invited you to come at the appointed time, and the open door confirms that invitation. Permission, therefore, is the same whether it is granted beforehand or at the moment, so long as you know the person has opened the door for no other reason than to let you in and that you have a prior arrangement with him—so enter.

Still, there is nothing amiss—in fact, it is unquestionably preferable—to greet with the salām when you walk in, if only to secure the reward promised for offering the greeting, its ensuing recompense, and your brother’s supplication when he replies, “And upon you be peace.”

The second verse is His statement, “And when your children reach puberty, let them seek permission just as those before them sought permission.” Reaching puberty (bulūgh) here refers to seminal emission, but the Qur’an expresses it with the word ḥulm (“dream”), because, in most cases, a person’s first release of semen occurs through a nocturnal emission.