Musannaf Ibn Abi Shaybah 24649 — A man against whose father a debt

Shurayh used to have a categorical oath taken from a man against whose father a debt was claimed: if he swore, well and good; otherwise it was taken from him. And if your father is owed a debt by a person, and you claim it from him, you shall establish the evidence; then if you swear along with your evidence, well and good; otherwise he shall not give it to you.