Sahih Muslim | Book 35 | Hadith Number 6579

Narrated by Ibn Abi Laili
This hadith has been transmitted on the authority of Ibn Abi Laili but with this addition: "Ali said: Ever since I heard this (supplication) from Allah's Apostle (may peace be upon him), I never abandoned it. It was said to him, Not even in the night of Siffin (battle of Siffin)? He sad: Yes, not even in the night of Siffin,