8:15a and said: “Blessed be the LORD, the God of Israel,

Then he said, “Bless/Praise (plur) Yahweh, the God of Israel!
-or-
He said: “How good is Yahweh, the God whom ⌊we(incl.) ⌋ ⌊the people of⌋ Israel ⌊worship⌋ !

8:15b who has fulfilled with His own hand

For he has worked/acted in power to fulfill
-or-
By his power he has done exactly

8:15c what He spoke with His mouth to my father David, saying,

his words of promise to my father David.
-or-
what he personally/directly told my father David that he would do.

8:15b-c (reordered)

He made/spoke a promise to my father David, and now by his power he has fulfilled that promise.

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