Musnad Ahmad 32:359

Abu Amir narrated to us, Fulayh narrated to us, Uthman ibn Abd al-Rahman ibn Uthman al-Taymi narrated to me, that Anas informed him: "The Prophet, peace and blessings of Allah be upon him, used to pray the Friday prayer when the sun would incline. And when he would go out to Makkah, he would pray the Dhuhr prayer at the tree as two prostrations (rak'ahs)."