John Gills Exposition of the Bible Commentary - Psalms 51:15
O Lord, open thou my lips ,.... The Targum adds, "in the late"; which were shut with a sense of sin, with shame of it, and sorrow for it; and though they were in some measure opened in prayer to God for the forgiveness of it, as appears by various petitions in this psalm, yet he still wanted a free spirit and boldness at the throne of grace, which the believer has when his heart is sprinkled from an evil conscience by the blood of Christ; and especially his lips were shut as to praise and... read more
Matthew Henry's Complete Commentary - Psalms 51:14-19
I. David prays against the guilt of sin, and prays for the grace of God, enforcing both petitions from a plea taken from the glory of God, which he promises with thankfulness to show forth. 1. He prays against the guilt of sin, that he might be delivered from that, and promises that then he would praise God, Ps. 51:14. The particular sin he prays against is blood-guiltiness, the sin he had now been guilty of, having slain Uriah with the sword of the children of Ammon. Hitherto perhaps he had... read more