“I only know it from Anas bin Malik who said: 'No case involving retaliation was referred to the Messenger of Allah (ﷺ) but he enjoined forgiveness.”
Sunan Ibn Majah Book 21, Hadith 78
← Previous Hadith “A man brought the killer of his relative to the Messenger of Allah (ﷺ) and the Messenger of Allah (ﷺ) said: 'Pardon him,' but the refused. He said: 'Take the blood money,' but he refused. He said: 'Go and kill him, but then you will be like him.’ Someone caught up with him and reminded him that the Messenger of Allah (ﷺ) had said: 'Go and kill him, but then you will be like him.’ So he let him go. He said: So he was seen dragging his strap going to his family. He said: It seemed that he had tied him up.

It's narrated that AbdurRahman bin AlQasim said "Then it is not (permissible) for anyone after the Prophet ﷺ to say 'Go and kill him, but then you will be like him.' "

Sunan Ibn Majah Book 21, Hadith 77 Next Hadith → “I heard the Messenger of Allah (ﷺ) say: 'There is no man who suffers some (injury) on his body and forgives (the perpetrator), but Allah (SWT) will raise him one degree in status thereby, or erase from him one sin.'My own ears heard it and my heart memorized it.”

Sunan Ibn Majah Book 21, Hadith 79