14–15 Second, praise is an appropriate response to divine deliverance (see Reflections, p. 544, Yahweh Is My Redeemer). Deliverance here is from “bloodguilt” (lit., “bloods,” v. 14). “Bloodguilt” could signify either the judgment resulting from a grave sin requiring the death penalty (cf. Eze 18:13) or the sin that led to the death of an innocent person (cf. 2 Sa 12:5, 13). The person who has tasted the grace of God in life cannot but praise him for a new lease on life. God’s righteousness manifests itself not only in judgment (v. 4), but also in forgiveness and fidelity to his covenant (cf. 1 Jn 1:9) when he sets aside the just penalty for sin (v. 14). The sinner looks to his “Lord” (Adonai, “master”) for renewed favor (“open my lips”) so that he may freely praise him for his grace (v. 15).
51:15 My lips have been sealed shut by my sin. Open them by Your forgiveness and my mouth will be dedicated to speaking and singing Your praise.
51:14–17 Then I Will Worship Truly. The terms in this section, such as sing aloud (v. 14), declare (v. 15), and sacrifice (vv. 16–17), all point to activities of public worship. The person who has used this psalm to confess his sins and to receive God’s assurance of pardon is the one who can genuinely worship the gracious God of the covenant.
 VanGemeren, W. A. (2008). Psalms. In T. Longman III & D. E. Garland (Eds.), The Expositor’s Bible Commentary: Psalms (Revised Edition) (Vol. 5, p. 439). Grand Rapids, MI: Zondervan.
 MacDonald, W. (1995). Believer’s Bible Commentary: Old and New Testaments. (A. Farstad, Ed.) (p. 631). Nashville: Thomas Nelson.
 Crossway Bibles. (2008). The ESV Study Bible (p. 1000). Wheaton, IL: Crossway Bibles.