Musnad Ahmad 30:3049

Waki' narrated to us, Faraj ibn Fudalah narrated to us, from Abu Sa'd al-Homsi, who said: I heard Abu Hurairah saying: A supplication I memorized from the Messenger of Allah, may Allah bless him and grant him peace, which I will not abandon: "O Allah, make me the greatest of Your thankful ones, the most follower of Your advice, the most frequent of Your remembrance, and the most keeper of Your commandment."