John Gill Commentary Psalms 40:9

"I have proclaimed glad tidings of righteousness in the great assembly; Lo, I will not refrain my lips, O Jehovah, thou knowest." — Psalms 40:9 (ASV)

I have preached righteousness in the great congregation
Not the righteousness which the law requires men to do; but the righteousness which Christ himself wrought out, for the justification of them that believe; this he was a preacher, as well as the author of, and is part of the glad tidings he was anointed to preach, (Isaiah 61:1);

and the word ^F14 here used signifies, for the most part, the publishing of good tidings; and this our Lord did publicly, before all the people, in the synagogues of the Jews, and in the temple, where the people in great numbers resorted; especially at the three great festivals in the year; the feasts of passover, pentecost, and tabernacles, when all the males were obliged to appear, and made up a great congregation indeed; see (John 2:23) (John 5:1John 5:14) (8:2) (18:20);

lo, I have not refrained my lips, O Lord, you know ;
Christ appeals to his divine Father, the searcher of hearts, and trier of reins, for the truth of this; that he had not laid any restraint upon his lips, nor kept back anything in his ministry that was profitable; but had taught the way of God in great integrity and sincerity; had opened his mouth, and spoke freely and fully, and used great plainness of speech.

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FOOTNOTES:

• F14: (ytrvb) (euhggelisamhn) Sept. "evangelizavi", Schmidt, Michaelis; "I have preached the glad tidings of justice", Ainsworth.