Matthew 5:29-30

If then thine eye, the right, leads thee to offend, pluck it out, and cast it from thee: for it is highly for thy advantage, that one of thy members be destroyed, and not that thy whole body should be cast into hell.

Mark 9:43-49

And if thy hand cause thee to offend, cut it off: it were better for thee to enter into life maimed, than having both hands to go into hell, into the fire that never will be quenched:

Romans 8:13

For if ye live after the flesh, ye are ready to die: but if by the Spirit ye mortify the deeds of the body, ye shall live.

Treasury of Scripture Knowledge

Summary

Though he spare it, and forsake it not; but keep it still within his mouth:

Bible References

Spare it

Matthew 5:29
If then thine eye, the right, leads thee to offend, pluck it out, and cast it from thee: for it is highly for thy advantage, that one of thy members be destroyed, and not that thy whole body should be cast into hell.
Mark 9:43
And if thy hand cause thee to offend, cut it off: it were better for thee to enter into life maimed, than having both hands to go into hell, into the fire that never will be quenched:
Romans 8:13
For if ye live after the flesh, ye are ready to die: but if by the Spirit ye mortify the deeds of the body, ye shall live.