Jamieson, Fausset and Brown on Hosea 8:2

2. My God, we know thee--the singular, "My," is used distributively, each one so addressing God. They, in their hour of need, plead their knowledge of God as the covenant-people, while in their acts they acknowledge Him not (compare Mt 7:21, 22; Tit 1:16; also Is 29:13; Jr 7:4). The Hebrew joins "Israel," not as English Version, with "shall cry," but "We, Israel, know thee"; God denies the claim thus urged on the ground of their descent from Israel.