He said, Amash informed us that he said, "Purification and mercy."
قال أخبرنا الأعمش أنه قال زكاة ورحمة
No references are available.
Its isnad is sahih. It was previously mentioned in 8184. Bukhari narrated something similar to it, 8/96, in the chapter on supplications, on the saying of the Prophet ﷺ, "Whoever I have hurt, make it a means of purification for him." Muslim narrated it, 4/2010, no. 2603, in the chapter on righteousness, on those the Prophet ﷺ cursed. And Ibn Abu Shayba narrated it, 10/339, no. 9600, in the chapter on supplication, on what has been mentioned about the Prophet ﷺ praying for one who cursed him.