Musannaf Ibn Abi Shaybah

Hazrat Sufyan narrates that Hazrat Ali (may Allah be pleased with him) bin Aqmar said: I found one of our slaves who was working in a well located in Utbah's house. I presented his case before Hazrat Shurayh, so he said: You must clarify that they had compelled him, otherwise, whomever you wish from the household will take an oath on your behalf.