For the source text click/tap here: Bava Kamma 93
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§ The mishna teaches: With regard to one who says to another: Blind my eye, or: Cut off my hand, or: Break my leg, and he does so, the latter is liable to pay for the damage, even if the injured party explicitly instructed him to do so on the condition that he will be exempt from payment.
The Gemara comments that this is also taught in a baraita. With regard to one who said to another: Strike me, or wound me; and the other asks: Is this on the condition that I will be exempt from payment? And the first one said to him, in the tone of a question: Yes, this is an example of the principle: There is a yes that is like a no. It is as if the victim asked: Even if I give you permission to do it, do you think that I would forgo the compensation?
We explore the Jewish attitude to boxing as well as the controversial Rambam regarding wife-beating.