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Hosea 5:3
I know Ephraim, and Israel is not hid from me: for now, O Ephraim, thou committest whoredom, and Israel is defiled. (Hosea 5:3)
O Ephraim.
This powerful, leading tribe was apparently the ringleader in calf worship and other idolatries, through this evil influence all Israel was defiled.
Not hid from me.
 See on v. 2.