Musnad Abu Ya'la al-Mawsili 148:80

Abu Khaythama narrated to us, Yunus ibn Muhammad narrated to us, Fulayh narrated to us, from Uthman ibn Abd al-Rahman, that Anas ibn Malik informed him: That the Messenger of Allah (may Allah bless him and grant him peace) used to pray the Asr prayer at a time equivalent to a man going to the Banu Harithah ibn al-Harith and returning before the setting of the sun, and equivalent to a man slaughtering a camel and cutting it into pieces before the setting of the sun. And he would not pray the Jumu'ah (Friday) prayer until the sun had declined. And when he went out to Makkah, he would pray the Dhuhr prayer at the tree as two rak'ahs.