Psalms 40:9

I have preached righteousness in the great congregation: lo, I have not refrained my lips, O LORD, thou knowest.

I have preached righteousness in the great congregation. From the fulfilling of God's will in deeds he I have preached righteousness in the great congregation. From the fulfilling of God's will in deeds he passes to words. The Hebrew for "preached" х baasar (H1319)] means to announce good tidings, new and unheard before, as "Gospel" means. So the Septuagint translate here [eueengelisameen], and the Ethiopic. So in Isaiah 40:9; Isaiah 61:1. The Syriac, Arabic, and Vulgate read, 'thy righteousness.' The Septuagint, in most manuscripts, read, 'my righteousness.' The believer's righteousness is not his own, but Christ's imputed to him. The "righteousness" of God is especially "declared" in redemption (Daniel 9:24; Romans 3:25). The law of God, violated by man, is therein vindicated and magnified by the Son of man (Isaiah 42:21). In relation to David, the type, "the righteousness of God" consisted in God's having given to him, as having a righteous cause, and to his enemies, as having an unrighteous cause, their respective dues. Messiah, David's Antitype, declares that He not merely had the law of God within his heart (Psalms 40:8), but that He proclaimed with His lips "righteousness" in general as the essence of that law; then, in Psalms 40:10, he proceeds to appropriate that "righteousness" as altogether and peculiarly God's: 'THY righteousness I hide not in my heart,' in qualification of the previous, "thy law is within my heart" (Psalms 40:8). Though within my heart, as its inner seat, I do not hide it from outward manifestation to others.