John Gill Commentary Matthew 18:8

"And if thy hand or thy foot causeth thee to stumble, cut it off, and cast it from thee: it is good for thee to enter into life maimed or halt, rather than having two hands or two feet to be cast into the eternal fire." — Matthew 18:8 (ASV)

Ver. 8, 9. Therefore if your hand or your foot
The same words are repeated here on occasion of offences, as are spoken by Christ, (Matthew 5:29Matthew 5:30) on account of unchaste looks, desires and lusts: giving offence to Christ's disciples, or endeavouring, by any means whatever, to cause them to stumble and fall, is equally gratifying the flesh, and no more to be indulged, than the other, on pain of eternal damnation. (See Gill on Matthew 5:29) (See Gill on Matthew 5:30)