Musannaf Ibn Abi Shayba 13:3432

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Usama bin Zayd narrated to us, from Abdullah bin Rafi’, from Umm Salama, that the Prophet, peace and blessings of Allah be upon him, said to two men: "Draw lots between yourselves, then seek the truth, and then let each one of you absolve his companion."