David wrote Psalm 18 after he won victory over the previous king of Israel, Saul.

Psalm 18:

I love you, Lord;
    you are my strength.
² The Lord is my rock, my fortress, and my savior;
    my God is my rock, in whom I find protection.
He is my shield, the power that saves me,
    and my place of safety.
³ I called on the Lord, who is worthy of praise,
    and he saved me from my enemies.