When ʿAbdur-Rahman came to us, the Prophet ﷺ established a bond of brotherhood between him and Saʿd bin Ar-Rabiʿ. Once the Prophet ﷺ said, "As you (O ʿAbdur-Rahman) have married, give a wedding banquet even if with one sheep."  

لَمَّا قَدِمَ عَلَيْنَا عَبْدُ الرَّحْمَنِ فَآخَى النَّبِيُّ ﷺ بَيْنَهُ وَبَيْنَ سَعْدِ بْنِ الرَّبِيعِ فَقَالَ النَّبِيُّ ﷺ أَوْلِمْ وَلَوْ بِشَاةٍ  

I said to Anas bin Malik, "Did it reach you that the Prophet ﷺ said, "There is no treaty of brotherhood in Islam'?" Anas said, "The Prophet ﷺ made a treaty (of brotherhood) between the Ansar and the Quraish in my home."  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ حِلْفَ فِي الإِسْلاَمِ فَقَالَ قَدْ حَالَفَ النَّبِيُّ ﷺ بَيْنَ قُرَيْشٍ وَالأَنْصَارِ فِي دَارِي