Musnad Ahmad 932:2

Waki' narrated to us, Sufyan narrated to us, from Abdullah ibn Muhammad ibn Aqil, from al-Tufayl ibn Ubayy ibn Ka'b, from his father, who said: A man said: "O Messenger of Allah, what if I were to make all of my prayer [supplication] for you?" He said: "Then Allah will suffice you for what concerns you of your worldly life and your Hereafter."