Musannaf Ibn Abi Shaybah 23156 — Testimony from hearing: may he

Ibrahim and al-Sha'bi (may Allah have mercy on them) said: When the polytheists come to you and appoint you as their arbiter according to the ruling of the Muslims, do not take them to any ruling other than that of Islam; otherwise step aside from between them and their co-religionists and turn away from them.