Musannaf Ibn Abi Shaybah 22365 — Those who returned a slave

Zayd Abu al-Mu'alla (may Allah have mercy on him) said: I was present with Iyas bin Mu'awiyah (may Allah have mercy on him) when a dispute over a slave-woman was brought to him. A man said: "I bought a slave-woman from this man, and she is foolish." He (may Allah have mercy on him) said: "I do not know that one is returned because of foolishness." The man said: "Foolishness is just like madness." He (may Allah have mercy on him) asked the woman (the slave) in Persian: "Do you remember the night on which you were born?" She said: "Yes." He (may Allah have mercy on him) asked her: "Which of your legs is longer?" Pointing to one of her legs, she said: "This one." So she was returned to her former owner.