Hadith 9

Sahih Bukhari

Book 52: Witnesses

Chapter 7

To give witness concerning lineage, foster suckling relations and dead persons

باب الشَّهَادَةِ عَلَى الأَنْسَابِ وَالرَّضَاعِ الْمُسْتَفِيضِ وَالْمَوْتِ الْقَدِيمِ

The Prophet ﷺ said, "I and Abu Salama were suckled by Thuwaiba." The necessity of being sure of the witness in such cases.
وَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَرْضَعَتْنِي وَأَبَا سَلَمَةَ ثُوَيْبَةُ». وَالتَّثَبُّتِ فِيهِ.
Sahih al-Bukhari 2645
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا هَمَّامٌ، حَدَّثَنَا قَتَادَةُ، عَنْ جَابِرِ بْنِ زَيْدٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم فِي بِنْتِ حَمْزَةَ ‏ ‏‏.‏
"‏ لاَ تَحِلُّ لِي، يَحْرُمُ مِنَ الرَّضَاعِ مَا يَحْرُمُ مِنَ النَّسَبِ، هِيَ بِنْتُ أَخِي مِنَ الرَّضَاعَةِ ‏"
Ibn `Abbas:

The Prophet (ﷺ) said about Hamza's daughter, "I am not legally permitted to marry her, as foster relations are treated like blood relations (in marital affairs). She is the daughter of my foster brother."