Sahih Muslim Book - 27, Hadith - 4338

حَدَّثَنَا أَبُو الرَّبِيعِ سُلَيْمَانُ بْنُ دَاوُدَ الْعَتَكِىُّ حَدَّثَنَا حَمَّادٌ - يَعْنِى ابْنَ زَيْدٍ - عَنْ عَمْرِو بْنِ دِينَارٍ عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ أَنَّ رَجُلاً مِنَ الأَنْصَارِ أَعْتَقَ غُلاَمًا لَهُ عَنْ دُبُرٍ لَمْ يَكُنْ لَهُ مَالٌ غَيْرُهُ فَبَلَغَ ذَلِكَ النَّبِىَّ -صلى الله عليه وسلم- فَقَالَ « مَنْ يَشْتَرِيهِ مِنِّى ». فَاشْتَرَاهُ نُعَيْمُ بْنُ عَبْدِ اللَّهِ بِثَمَانِمِائَةِ دِرْهَمٍ فَدَفَعَهَا إِلَيْهِ. قَالَ عَمْرٌو سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ يَقُولُ عَبْدًا قِبْطِيًّا مَاتَ عَامَ أَوَّلَ.

It was narrated from Jabir bin 'Abdullah that a man among the Ansar declared that a slave of his would become free after he died, and he did not own any other wealth apart from the slave. News of that reached the Prophet (s.a.w) and he said: "Who will buy him from me?" Nu'aim bin 'Abdullah bought him for a price of eight hundred Dirham, and he gave it to him. 'Amr said: "I heard Jabir bin 'Abdullah say: 'He was a Coptic slave who died last year."'