(66) باب بَيْعِ الْحَيَوَانِ بِالْحَيَوَانِ يَدًا بِيَدٍ مُتَفَاضِلاً
It was narrated that Jabir Sair:
"A slave came and gave his pledge to the Messenger of Allah to emigrate, and the Prophet did not realize that he was a slave. Then his master came looking for him. The Prophet said; 'Sell him to me.' So he bought him for two black slaves, then he did not accept until he had asked; 'Is he a slave?'''
Reference: Sunan an-Nasa'i 4621
In-book reference: Book 44, Hadith 173
English translation: Vol. 5, Book 44, Hadith 4625