No. 3901

Jabir (Allaah be pleased with him) reported: There came a slave and pledg- ed allegiance to Allaah's Prophet (sallAllaahu alayhi wa sallam) on migration; he (the Prophet) did not know that he was a slave. Then there came his master and demanded him back, whereupon Allaah's Prophet (sallAllaahu alayhi wa sallam) said: Sell him to me. And he bought him for two black slaves, and he did not afterwards take allegiance from anyone until he had asked him whether he was a slave (or a free man)