Musannaf Ibn Abi Shayba 13:2897

Abu Bakr narrated to us, he said: Ali ibn Mushir narrated to us, from al-Ajalh, from al-Sha’bi, from Shurayh, who said: I reject the testimony of six: the suspicious adversary, the one warding off a fine, the partner for his partner, the hired worker for the one who hired him, and the slave for his master.