Musannaf Ibn Abi Shaybah 32629 — Reports on talk about rulers

Sulaym bin Hanzalah said: We came to Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) to talk with him. When he stood up to walk, we also stood up to walk with him. Then Sayyiduna Umar (may Allah be pleased with him) met him and raised his whip over him. He said: "O Commander of the Believers, what is this you are doing?" He said: "Do you not see this? This is a trial for the one who walks in front and a humiliation for the one who walks behind."