Musnad Ahmad 30:2061

Mu'awiyah narrated to us, he said: Za'idah narrated to us, he said: 'Abdullah ibn Dhakwan Abu al-Zinad narrated to us, from 'Abd al-Rahman, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever catches a prostration before the rising of the sun has caught the prayer, and whoever catches a prostration before the setting of the sun has caught the prayer."