Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
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Psalms 18:1

For the Chief Musician. By David the servant of Yahweh, who spoke to Yahweh the words of this song in the day that Yahweh delivered him from the hand of all his enemies, and from the hand of Saul. He said, I love you, Yahweh, my strength.

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