Musannaf Ibn Abi Shayba 28:1188

Waki’ narrated to us, he said: Salam bin Miskin narrated to us, from Ibn Sirin, who said: When Umar would appoint a man, he would write in his covenant: "Listen to him and obey him as long as he is just among you." He said: When he appointed Hudhayfah, he wrote in his covenant: "Listen to him and obey him, and give him what he asks of you." He said: So Hudhayfah arrived at al-Mada'in upon a donkey, on a pack-saddle, with a loaf of bread in his hand, sweating. Waki’ said: Malik said, from Talhah: "With his legs dangling from one side." Salam said: When he read his covenant to them, they said: "Ask us." He said: "I ask you for food to eat, and fodder for this donkey of mine." He said: So he stayed among them for as long as Allah willed. Then Umar wrote to him: "Come." So he departed. When his arrival reached Umar, he hid for him in a place where he could see him. When he saw him in the same state as he was when he departed from him, Umar came to him, embraced him, and said: "You are my brother, and I am your brother."