Hadith.3824 - Hamzah ibn Humran narrates: I said to Abu Abdullah (as): I enter the market intending to buy a bondwoman, but she claims that she is free.
The Imam (as) replied: "Buy her unless she has evidence (to prove her claim of freedom)."
Al-Kāfi #748“I once said to abu ‘Abd Allah (a.s.), ‘I go to the market to buy a slave-girl and she says that she is free. He (the Imam) said, ‘You can...