Musannaf Ibn Abi Shayba 21:379

Waki' narrated to us, from Shu'bah, from 'Amr ibn Murrah, from 'Abdullah ibn Salamah, from 'Ali, who said: I fell ill, so the Prophet (peace be upon him) entered upon me, and he heard me saying: "O Allah, if my appointed time has arrived, then have mercy on me; and if it is delayed, then heal me and grant me well-being; and if it is a trial, then grant me patience." The Prophet (peace be upon him) said: "What did you say?" So I repeated it to him. He wiped me with his hand and said: "O Allah, heal him or grant him well-being." And I did not complain of that pain after that.