James 2:10 - Ellicott's Commentary On The Whole Bible

For whosoever shall keep... — Better, have kept the whole Law, but shall have offended in one, has become guilty of all. As a chain is snapped by failure of the weakest link, so the whole Law, in its harmony and completeness as beheld by God, is broken by one offence of one man; and the penalty falls, of its own natural weight and incidence, on the culprit.