Hadith 3105 - One-fifth of Booty to the Cause of Allah (Khumus) - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

57. One-fifth of Booty to the Cause of Allah (Khumus) - كتاب فرض الخمس

4) Chapter: The houses of the wives of the Prophet saws

Narrated `Amra bint `Abdur-Rahman:

`Aisha, the wife of the Prophet (ﷺ) told her that once Allah's Messenger (ﷺ) was with her and she heard somebody asking permission to enter Hafsa's house. She said, "O Allah's Messenger (ﷺ)! This man is asking permission to enter your house." Allah's Messenger (ﷺ) replied, "I think he is so-and-so (meaning the foster uncle of Hafsa). What is rendered illegal because of blood relations, is also rendered illegal because of the corresponding foster-relations."

Reference: 3105
English reference: Vol. 4, Book 53, Hadith 337
In-book reference: Book 57, Hadith 14
Grade: Sahih
Read this hadith from Darussalam Collection

4) باب مَا جَاءَ فِي بُيُوتِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم، وَمَا نُسِبَ مِنَ الْبُيُوتِ إِلَيْهِنَّ

وَقَوْلِ اللَّهِ تَعَالَى: {وَقَرْنَ فِي بُيُوتِكُنَّ} وَ{لاَ تَدْخُلُوا بُيُوتَ النَّبِيِّ إِلاَّ أَنْ يُؤْذَنَ لَكُمْ}.

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ عَمْرَةَ ابْنَةِ عَبْدِ الرَّحْمَنِ، أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم أَخْبَرَتْهَا أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ عِنْدَهَا، وَأَنَّهَا سَمِعَتْ صَوْتَ إِنْسَانٍ يَسْتَأْذِنُ فِي بَيْتِ حَفْصَةَ فَقُلْتُ يَا رَسُولَ اللَّهِ، هَذَا رَجُلٌ يَسْتَأْذِنُ فِي بَيْتِكَ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏‏‏.‏ "‏ أُرَاهُ فُلاَنًا، لِعَمِّ حَفْصَةَ مِنَ الرَّضَاعَةِ، الرَّضَاعَةُ تُحَرِّمُ مَا تُحَرِّمُ الْوِلاَدَةُ ‏"