Matthew Poole and continuators on Hebrews 10:31

31 It is a fearful thing to fall into the hands of the living God.

The Punishment of these Apostates is further aggravated from the Inflictor of it, the knowledg of which should make them tremble; the Thoughts of it might affect them, as the Hand-writing on the Wall did Belshazzar, Dan. 5.6. It should strike horror into their Heart, trembling into their Persons, Deut. 28.65, 66. by Apostacy from him as a Father, to be subjected to him as a Judge, and as obnoxious to his severest Judgment. Him in whose hand is Power inexpressible, 1 Chro. 29.12. to avenge himself on his Enemies, Psalm 90.11. who have renounced him as their God, and provoked him to fury by it. A God that will not repent of Vengeance, and who liveth ever to inflict it: Who lifts up his hand to Heaven, and saith, I live for ever, Deut. 32.39, 40. to punish as everlasting Burning, and a devouring Fire, such, Traitors to himself. So is he described, Isa. 33.14. Matth. 10.28. His Vengeance on these Apostates is like himself, everlasting.