Psalm 89:2-4

2I will declare that your love stands firm forever, that you have established your faithfulness in heaven itself.

3You said, “I have made a covenant with my chosen one, I have sworn to David my servant,

4‘I will establish your line forever and make your throne firm through all generations.’ ” The Hebrew has Selah (a word of uncertain meaning) here and at the end of verses 37, 45 and 48.