Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX2012

Psalms 51:1

(52) For the end, [a Psalm] of instruction by David, when Doec the Idumean came and told Saul, and said to him, David is gone to the house of Abimelech. Why do you, O mighty man, boast of iniquity in [your] mischief? All the day

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