Matthew Henry Commentary Hosea 8:1-4

"[Set] the trumpet to thy mouth. As an eagle [he cometh] against the house of Jehovah, because they have transgressed my covenant, and trespassed against my law. They shall cry unto me, My God, we Israel know thee. Israel hath cast off that which is good: the enemy shall pursue him. They have set up kings, but not by me; they have made princes, and I knew it not: of their silver and their gold have they made them idols, that they may be cut off." — Hosea 8:1-4 (ASV)

When Israel was hard pressed, they would claim protection from God, but this would be disregarded. Of what use will it be to say, My God, I know You, if we cannot say, My God, I love You, serve You, and hold fast to You only?