Sahih al-Bukhari 2293
Sahih al-Bukhari · Book 39: Kafalah · The Statement of Allah jala jalaaluhu:"... To those also with whom you have made a pledge, give them their due portion by Wasiya..."
Narrated Anas:
حَدَّثَنَا قُتَيْبَةُ ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ ، عَنْ حُمَيْدٍ ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَدِمَ عَلَيْنَا عَبْدُ الرَّحْمَنِ بْنُ عَوْفٍ فَآخَى رَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَهُ وَبَيْنَ سَعْدِ بْنِ الرَّبِيعِ.
`Abdur-Rahman bin `Auf came to us and Allah's Messenger (ﷺ) established a bond of brotherhood between him and Sa`d bin Rabi`a.