8:24a You have kept Your promise to Your servant, my father David.

The promise you made to your servant David, my father, you have kept.
-or-
You have done what you promised to do for my father David, who served you.

8:24b What You spoke with Your mouth

You yourself spoke the promise,
-or-
You chose to make him this promise,

8:24c You have fulfilled with Your hand this day.

and by your power you fulfilled/performed it. ⌊We here⌋ today ⌊have seen⌋ this.
-or-
and you have acted to make it come/prove true. ⌊We are witnesses⌋ of that today.

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