Narrated Jabir:

"A slave came to give the pledge to the Prophet ﷺ for Hijrah, but the Prophet ﷺ did not realize that he was a slave. So his master came, and the Prophet ﷺ said: 'Sell him to me.' So he purchased him for two black slaves. After this he ﷺ would not take the pledge from anyone until he asked him if he was a slave."

[He said:] There is something on this topic from Ibn 'Abbas.

[Abu 'Eisa said:] The Hadith of Jabir is Hasan Gharib Sahih, we do not know of it except as a narration of Abu Az-Zubair.

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا اللَّيْثُ بْنُ سَعْدٍ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، أَنَّهُ قَالَ جَاءَ عَبْدٌ فَبَايَعَ رَسُولَ اللَّهِ ﷺ عَلَى الْهِجْرَةِ وَلاَ يَشْعُرُ النَّبِيُّ ﷺ أَنَّهُ عَبْدٌ فَجَاءَ سَيِّدُهُ فَقَالَ النَّبِيُّ ﷺ " بِعْنِيهِ " . فَاشْتَرَاهُ بِعَبْدَيْنِ أَسْوَدَيْنِ وَلَمْ يُبَايِعْ أَحَدًا بَعْدُ حَتَّى يَسْأَلَهُ أَعَبْدٌ هُوَ . قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ .

قَالَ أَبُو عِيسَى حَدِيثُ جَابِرٍ حَدِيثٌ حَسَنٌ غَرِيبٌ صَحِيحٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ أَبِي الزُّبَيْرِ .