A man pledged that his slave would be manumitted after his death. The Prophet ﷺ asked, "Who will buy the slave from me?" Nu'aim bin ʿAbdullah bought the slave and the Prophet ﷺ took its price and gave it to the owner.
النَّبِيُّ ﷺ مَنْ يَشْتَرِيهِ مِنِّي فَاشْتَرَاهُ نُعَيْمُ بْنُ عَبْدِ اللَّهِ فَأَخَذَ ثَمَنَهُ فَدَفَعَهُ إِلَيْهِ
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
A man pledged that his slave would be manumitted after his death. The Prophet ﷺ asked, "Who will buy the slave from me?" Nu'aim bin ʿAbdullah bought the slave and the Prophet ﷺ took its price and gave it to the owner. (Using translation from Bukhārī 2403)
رَسُولُ اللهِ ﷺ «مَنْ يَشْتَرِيهِ؟» فَاشْتَرَاهُ نُعَيْمُ بْنُ عَبْدِ اللهِ فَأَخَذَ رَسُولُ اللهِ ﷺ ثَمَنَهُ فَأَعْطَاهُ إِيَّاهُ