Matthew Poole and continuators on Psalms 111:9

9 He sent redemption unto his people, he hath commanded his covenant for ever : holy and reverend is his name.

That deliverance out of Egypt, which was a type and pledge of that greater and higher redemption by Christ.

i. e. Appointed or established firmly by his power and authority. And so this word is oft used, as Psal. 33. 9. & 42. 9. & 105. 31. 34. See also before on v. 7. the ground of which signification may be taken from hence, that the command of a sufficient authority concerning any thing, doth commonly establish and effect it.

Through all successive generations of his people to the end of the world; for the Covenant is the same for substance in all, and differeth onely in circumstances.

Terrible to his enemies, and venerable in his peoples eyes, and holy in all his dealings with all men.