Muwatta Malik, Book 30, Hadith 1275 (In-Book) ⓘ

Yahya related to me from Malik from Abdullah ibn Abi Bakr from Amra bint Abd ar-Rahman that A'isha, umm al-muminin informed her that the Messenger of Allah, may Allah bless him and grant him peace, was with her and she heard the voice of a man asking permission to enter the room of Hafsa. A'isha said that she had said, "Messenger of Allah! There is a man asking permission to enter your house!" The Messenger of Allah, may Allah bless him and grant him peace, said, "I think it is so-and-so" (referring to a paternal uncle of Hafsa by suckling). A'isha said, "Messenger of Allah! If so-and-so were alive (referring to her paternal uncle by suckling) could he enter where I am?" The Messenger of Allah, may Allah bless him and grant him peace, said, "Yes. Suckling makes haram as birth makes haram."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ، أَنَّ عَائِشَةَ أُمَّ الْمُؤْمِنِينَ، أَخْبَرَتْهَا أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ عِنْدَهَا وَأَنَّهَا سَمِعَتْ صَوْتَ رَجُلٍ يَسْتَأْذِنُ فِي بَيْتِ حَفْصَةَ قَالَتْ عَائِشَةُ فَقُلْتُ يَا رَسُولَ اللَّهِ هَذَا رَجُلٌ يَسْتَأْذِنُ فِي بَيْتِكَ ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أُرَاهُ فُلاَنًا ‏"‏ ‏.‏ لِعَمٍّ لِحَفْصَةَ مِنَ الرَّضَاعَةِ ‏.‏ فَقَالَتْ عَائِشَةُ يَا رَسُولَ اللَّهِ لَوْ كَانَ فُلاَنٌ حَيًّا - لِعَمِّهَا مِنَ الرَّضَاعَةِ - دَخَلَ عَلَىَّ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ نَعَمْ إِنَّ الرَّضَاعَةَ تُحَرِّمُ مَا تُحَرِّمُ الْوِلاَدَةُ ‏"‏ ‏.‏