ONCE, once for all — a single decisive time, not to be repeated. It is the hinge of Jude's appeal: contend for 'the faith HAPAX delivered to the holy ones' (1:3) — handed over ONCE, complete, not to be revised, added to, or traded. The same word carries the weight of Hebrews' 'once for all' sacrifice of Christ (Hebrews 9:26-28; 10:10): what is done hapax cannot be undone. → first discussed at Jude 1:3