Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1869
Jabir b. 'Abdullah reported: We used to observe (Jumu'a) prayer with the Messenger of Allah (may peace be upon him) and then we returned and gave rest to our camels used for carrying water. Hassan[ (one of the narrators) said: I asked Ja'far what time that was. He said.. It is the time when the sun passes the meridian.