A man decided that a slave of his would be manumitted after his death and later on he was in need of money, so the Prophet ﷺ took the slave and said, "Who will buy this slave from me?" Nu'aim bin ʿAbdullah bought him for such and such price and the Prophet ﷺ gave him the slave.
عَنْ دُبُرٍ فَاحْتَاجَ فَأَخَذَهُ النَّبِيُّ ﷺ فَقَالَ مَنْ يَشْتَرِيهِ مِنِّي فَاشْتَرَاهُ نُعَيْمُ بْنُ عَبْدِ اللَّهِ بِكَذَا وَكَذَا فَدَفَعَهُ إِلَيْهِ