Sahih al-Bukhari Book 65, Hadith 318
Aflah, the brother of Abi Al-Qu`ais, asked permission to visit me after the order of Al-Hijab was
revealed. I said, "I will not permit him unless I take permission of the Prophet (ﷺ) about him for it was not
the brother of Abi Al-Qu`ais but the wife of Abi Al-Qu`ais that nursed me." The Prophet (ﷺ) entered upon
me, and I said to him, "O Allah's Messenger (ﷺ)! Aflah, the brother of Abi Al-Qu`ais asked permission to
visit me but I refused to permit him unless I took your permission." The Prophet (ﷺ) said, "What stopped
you from permitting him? He is your uncle." I said, "O Allah's Messenger (ﷺ)! The man was not the person
who had nursed me, but the woman, the wife of Abi Al-Qu`ais had nursed me." He said, "Admit him,
for he is your uncle. Taribat Yaminuki (may your right hand be saved)" `Urwa, the sub-narrator
added: For that `Aisha used to say, "Consider those things which are illegal because of blood relations
as illegal because of the corresponding foster relations."
Sauda (the wife of the Prophet) went out to answer the call of nature after it was made obligatory (for all the Muslims ladies) to observe the veil. She had a large frame and everybody who knew her before could recognize her. So `Umar bin Al-Khattab saw her and said, "O Sauda! By Allah, you cannot hide yourself from us, so think of a way by which you should not be recognized on going out. Sauda returned while Allah's Messenger (ﷺ) was in my house taking his supper and a bone covered with meat was in his hand. She entered and said, "O Allah's Messenger (ﷺ)! I went out to answer the call of nature and `Umar said to me so-and-so." Then Allah inspired him (the Prophet) and when the state of inspiration was over and the bone was still in his hand as he had not put in down, he said (to Sauda), "You (women) have been allowed to go out for your needs."
It was said, "O Allah's Messenger (ﷺ)! We know how to greet you, but how to invoke Allah for you?" The Prophet said, "Say: Allahumma salli ala Muhammadin wa'ala `Ali Muhammaddin, kama sallaita 'ala all Ibrahim, innaka Hamidun Majid."