Did King David Teach A Works Based Salvation?

Psalms 119:166, “Lord, I have hoped for thy salvation, and done thy commandments.”
Psalms 119:174, “I have longed for thy salvation, O Lord; and thy law is my delight.”

I received a question today from a web visitor regarding the preceding two Bible verses:

QUESTION: I was reading the latter part of Psalm 119 today and came across these verses. Don't these verses say David is hoping for God's salvation by keeping the commandments?

ANSWER: Acts 10:43 teaches that "all" the prophets gave witness that remission of sins comes only through faith in the Messiah (the Christ). Acts 10:43, “To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins.” David was not teaching a works-based-salvation. We must never use an obscure passage of Scripture to contradict a clear one. The entire Gospel of John was written for the primary purpose of showing us the way of salvation, which is to believe on Christ (John 20:31). The Gospel of John is God's Gospel tract.

David trusted in God's righteousness, not his own.

Psalms 119:40, “Behold, I have longed after thy precepts: quicken me in thy righteousness.”

To "quicken" means to "make alive."

David trusted in God's righteousness, in God's salvation.

What saith the Scripture? Romans 4:5-7, “But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works, Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.” Here we see that David clearly understood the doctrine of Imputed Righteousness, which means that God credits His righteousness to us by faith alone.

Where did David speak of God's imputed righteousness? Romans 4:6 is a quote from the Old Testament. Psalms 32:1-2, “Blessed is he whose transgression is forgiven, whose sin is covered. Blessed is the man unto whom the LORD imputeth not iniquity, and in whose spirit there is no guile.” At the moment of the new birth, God imputes OUR sins to Jesus Christ by faith, and He imputes CHRIST'S righteousness to us by faith (2nd Corinthians 5:21). Some call this appropriately, “The Great Transfer.” I like that! Philippians 3:9, “And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith:”

So we can settle the matter about what David believed concerning salvation from Romans 4:6, which tells us that David trusted in God's imputed righteousness which is by faith alone.