Musannaf Ibn Abi Shayba 27:145

Waki’ narrated to us, from Sufyan, from ‘Abdullah ibn Muhammad ibn ‘Aqil, from Tufayl ibn Ubayy, 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 affairs and your Hereafter."