Musnad Ahmad 28:108

Yahya ibn Adam narrated to us, Abu Mu'awiyah and Ibn al-Mubarak narrated to us, from al-Awza'i, from Yahya ibn Abi Kathir, from Abu Salamah ibn 'Abd al-Rahman, from 'Abdullah ibn 'Amr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "O 'Abdullah, do not be like so-and-so; he used to pray at night, then he abandoned praying at night."