Hebrews 10:31 - Ellicott's Commentary On The Whole Bible

The living God. — As in Hebrews 3:12; Hebrews 9:14 the exact meaning of the writer’s words is “a Living God;” and a reference to the first of these passages (and to Hebrews 4:12) will show clearly what is their force in this place. There can be little doubt that Deuteronomy 32, from which he has been quoting, is still in his thought. See Deuteronomy 32:40 — “I lift up my hand to heaven, and say, I live for ever.”