Keil & Delitzsch

Wherefore David blessed the Lord before all the congregation,.... To whose goodness he ascribed both the ability and willingness of him, and his people, to offer after such a manner; he knew it was God that wrought in them both to will and to do, and therefore gave him the glory of it: and David said, blessed be thou, Lord God of Israel our Father, for ever and ever; the phrase, "our father", does not belong to the God of Israel, their father by covenant and adoption, but to Israel, or Jacob, the ancestor of the Jewish nation; who is made mention of on this occasion, he being the first that spoke of building an house for God, as some Jewish writers, Jarchi and Kimchi, observe, see Gen 28:22.