Musnad Ahmad 33:1140

Ali ibn Ishaq narrated to us, Abdullah ibn al-Mubarak narrated to us, Umar ibn Salamah ibn Abi Yazid narrated to us, my father narrated to me, he said: Jabir said to me: I said, "O Messenger of Allah, my father left behind a debt to some Jews." He said, "I will come to you on Saturday, if Allah wills." That was during the time of the dates, at the beginning of the palm harvest. When the morning of Saturday arrived, the Messenger of Allah (peace and blessings of Allah be upon him) came to me. When he entered my property, he approached the spring and performed ablution from it. Then he stood up to the mosque and prayed two rak'ahs. Then I brought him near to a tent of mine, and I spread out for him a garment made of hair, and I placed a cushion made of saddle-cloth of hair, stuffed with palm fiber. He leaned upon it. I had not waited but a little while when Abu Bakr appeared. It was as if he had looked at what the Prophet of Allah (peace and blessings of Allah be upon him) had done, so he performed ablution and prayed two rak'ahs. I had not waited but a little while when Umar came, and he performed ablution and prayed two rak'ahs, as if he had looked at his two companions. They entered, and Abu Bakr sat at his head and Umar at his feet.