משנה אויף בראשית 20:7

Even though a man pays [him that suffers the indignity], he is not forgiven until he seeks [forgiveness] from him, for it says: “Therefore restore the man’s wife… [and he shall pray for you]” (Genesis 20:7). And from where do we learn that he who must forgive should not be cruel? As it says: “And Abraham prayed unto God and God healed Avimelech” (Genesis 20:17). If a man said, “Blind my eye”, or “Cut off my hand”, or “Break my foot”, he [that does so] is liable. [If he added] “On the condition that you will be exempt”, he is still liable. [If he said] “Tear my garment”, or “Break my jug”, he that does so is liable. [If he added] “On the condition that you will be exempt”, he is exempt. [If he said], “Do so to so-and-so, on the condition that you will be exempt, he is liable, whether it was [an offense] against his person or his property.