Musnad Abu Ya'la al-Mawsili 108:157

Abu Bakr ibn Abi Shaybah narrated to us, Yahya ibn Adam narrated to us, Hasan ibn 'Ayyash narrated to us, from Ja'far, from his father, from Jabir: "We used to pray Jumu'ah with the Prophet, may Allah bless him and grant him peace, then we would return and rest our camels." Hasan said: "I said to Ja'far, 'At what time was that?'" He said: "The declining of the sun."