Musannaf Ibn Abi Shayba 3:2760

Yahya ibn Adam narrated to us, he said: Hasan ibn Ayyash narrated to us, from Ja’far ibn Muhammad, from his father, from Jabir ibn Abdullah, who said: We used to pray Jumu’ah with the Messenger of Allah (may Allah bless him and grant him peace), then we would return and give rest to our camels used for drawing water. Hasan said: I said to Ja’far, "And what time was that?" He said: "The declining of the sun."