Rav Huna said in the name of Rav Idi: It is written: “The people rejoiced in their donation, because they donated to the Lord wholeheartedly, and King David too rejoiced with great joy” (I Chronicles 29:9) – because they were engaged in the mitzva of donation and they were successful, that is why they rejoiced. Therefore, what does it say? “David blessed the Lord before the eyes of the entire congregation [and David said: Blessed is the Lord, God of Israel our father]…” (I Chronicles 29:10).
It does not say here: “God of Abraham, Isaac, and Israel,” but rather, “God of Israel our father” – he ascribed the vow to the one who began with it first. Rabbi Yehuda said: This place is also not lacking.1There is no need to go to Chronicles for proof, as there is proof elsewhere in the Bible. “Israel took a vow [vayidru]2Plural.” is not written here, but rather, “Israel took a vow [vayidar]3Singular.” (Numbers 21:2) – Israel the elder.