Narrated from Sayyiduna Ali (may Allah be pleased with him), he says: I said, "O Messenger of Allah! Shall I not tell you about a girl who is the most beautiful among the Quraysh?" The Prophet (peace and blessings be upon him) said, "Who is she?" I said, "The daughter of Sayyiduna Hamza." The Prophet (peace and blessings be upon him) said, "Do you not know that she is the daughter of my foster brother? Indeed, Allah has made unlawful by reason of suckling (fosterage) those relationships which are unlawful by reason of lineage."

It is narrated from Sayyiduna Ali (may Allah be pleased with him), he says: I said, "O Messenger of Allah! You prefer kinship among the Quraysh and leave us, that is, Banu Hashim." The Prophet (peace and blessings be upon him) said: "Do you have any kinship?" I said: "Yes, there is the daughter of Sayyiduna Hamza (Salma)." The Prophet (peace and blessings be upon him) said: "She is not lawful for me, because she is my foster niece."

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when the Messenger of Allah (peace and blessings be upon him) was informed about marrying the daughter of Sayyiduna Hamza, he (peace and blessings be upon him) said: She is my foster niece, and the relationship made unlawful by suckling is the same as that made unlawful by lineage, so she is not lawful for me.

Narrated by Sayyida Aisha (may Allah be pleased with her) that the Noble Prophet (peace and blessings be upon him) said: The relationship that becomes unlawful due to suckling (breastfeeding) is the same as that which becomes unlawful due to lineage, such as maternal uncle, paternal uncle, nephew, etc.

It is narrated from Sayyida Aisha (may Allah be pleased with her) that Aflaḥ, the brother of Abu Qu‘ais, sought permission to come to me, but I refused. When the Noble Prophet (peace and blessings be upon him) arrived, I said: O Messenger of Allah! Aflaḥ, the brother of Abu Qu‘ais, sought permission to come to me, but I did not allow him. The Prophet (peace and blessings be upon him) said: Allow him to come. I said: The woman nursed me, not the man? The Prophet (peace and blessings be upon him) said: May your right hand be covered in dust! Allow him to come, he is your foster-uncle.

(Second chain) It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: After the commandments of veiling were revealed, my foster uncle sought permission to come to me, … then the same hadith was narrated.

(Third chain) It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: Aflah bin Abi Qu’ais came and sought permission to enter upon me. The woman who had nursed Aisha, this man was the brother of her husband. So he sought permission to enter upon me, but I refused. When the Noble Prophet (peace and blessings be upon him) came to me, he said: Allow him to enter. … al-Hadith.

Abbad bin Mansur says: I said to Qasim bin Muhammad: My father's wife nursed a girl from among the people for my brothers; now can I marry that girl? He said: No, because now your and that girl's father is the same. Then he narrated the hadith of Abu Qais, and it is as follows: Abu Qais came to Lady Aisha (may Allah be pleased with her) and sought permission to enter upon her, but she did not grant him permission. When the Noble Prophet (peace and blessings be upon him) arrived, Lady Aisha (may Allah be pleased with her) said: O Messenger of Allah! Abu Qais came and sought permission to enter upon me, but I did not allow him. The Prophet (peace and blessings be upon him) said: He is your uncle; he should come to you. I said: The woman nursed me, not the man? The Prophet (peace and blessings be upon him) said: I am telling you, he is your uncle; he can come to you.

It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: The Noble Prophet (peace and blessings be upon him) was sitting with me when I heard the voice of a man who was seeking permission to enter the house of Sayyida Hafsa (may Allah be pleased with her). I said: O Messenger of Allah! This man is seeking permission to enter your house? The Messenger of Allah (peace and blessings be upon him) said: I think he is such-and-such foster uncle of Hafsa. I said: O Messenger of Allah! If my such-and-such foster uncle were alive, could he enter upon me? The Messenger of Allah (peace and blessings be upon him) said: Yes, absolutely, indeed fosterage makes unlawful those relationships which are made unlawful by lineage and birth.

Narrated from Sayyida Aisha (may Allah be pleased with her) that Sayyiduna Abu Hudhaifah (may Allah be pleased with him) had made Sayyiduna Salim (may Allah be pleased with him) his adopted son. Salim was a slave of a woman from the Ansar, she had freed him, and Sayyiduna Abu Hudhaifah (may Allah be pleased with him) had made him his adopted son, just as the Noble Prophet (peace and blessings be upon him) had made Sayyiduna Zaid (may Allah be pleased with him) his adopted son. In the era of ignorance, people used to do this. Then, whoever made someone an adopted son would call him by the name of son and he would be entitled to inheritance, until Allah Almighty revealed this command: {اُدْعُوْھُمْ لِآبَائِہِمْ … … فِی الدِّیْنِ وَمَوَالِیْکُمْ} Call them by (the names of) their fathers; that is more just in the sight of Allah. But if you do not know their fathers, then they are your brothers in religion and your friends. (Surah Al-Ahzab: 5) After this verse, the adopted sons were referred back to the names of their real fathers. Those whose fathers' names were not known, they were called friends or brothers. The wife of Sayyiduna Abu Hudhaifah, Sayyida Sahla (may Allah be pleased with her), came to the Noble Prophet (peace and blessings be upon him) and said: O Messenger of Allah! We have made Salim our son, he used to come to me and Abu Hudhaifah and would see me in my ordinary working clothes. Now he has grown up, and you know that Allah Almighty has also revealed this command regarding them that the adopted son is not real, call them by the names of their fathers. The Prophet (peace and blessings be upon him) said: So give him milk to drink five times, because of this you will become unlawful for him and he will become your foster son. In one narration it is stated: So Sahla gave him milk to drink five times and he became her foster son. Based on this incident, Sayyida Aisha (may Allah be pleased with her), when she wanted to see certain individuals, would order her sisters and nieces to give them milk to drink, even if they were adults. When they had given them milk to drink five times, they could enter. But Sayyida Umm Salama (may Allah be pleased with her) and the other pure wives of the Noble Prophet (peace and blessings be upon him) did not allow anyone to enter on the basis of this fosterage. They considered only that fosterage valid which occurred during the age of suckling, and they used to say to Sayyida Aisha (may Allah be pleased with her) that perhaps this concession was not for other people, but only for Sayyiduna Salim, that he drank milk even in adulthood, so fosterage was established.