John Lightfoot on Matthew 5:30

[If thy right hand offend thee, cut it off.] See here Babyl. Niddah, fol. 13, quite through. Among other things, R. Tarphon saith, "Whosoever brings his hand to his modest parts, let his hand be cut off unto his navel." And a little after; "It is better that his belly should be cleft in two, than that he should descend into the well of corruption." The discourse is of moving the hand to the privy member, that, by the handling it, it might be known whether the party had the gonorrhea, or no: and yet they adjudge never so little handling it to cutting off the hand. Read the place, if you have leisure.