Jesus deals with this topic of the mortification of sin in Matthew 5:29-30.

“And if your right eye makes you stumble, tear it out, and throw it from you; for it is better for you that one of the parts of your body perish, than for your whole body to be thrown into hell. 30 “And if your right hand makes you stumble, cut it off, and throw it from you; for it is better for you that one of the parts of your body perish, than for your whole body to go into hell.

Some do not identify this passage as one that deals with the mortification of sin, but D. Martyn Lloyd-Jones, in his book, Studies in the Sermon on the Mount insists that it does. And notice that it comes directly after verses 27-28, which deals with the sin of adultery; or more precisely, adultery in the…