Hosea 5:3 - Matthew Poole's English Annotations on the Holy Bible

These revolters neither are nor can be so deep as to conceal themselves, their designs, contrivances, and practices, from me; I thoroughly know Ephraim. The revolters are also called Israel in this verse, who is not hid from me. It is an elegant repetition of the same thing in different words. Thou committest whoredom; all thy fair pretences thou canst put upon thy devised religion cannot better it, still it is downright idolatry or spiritual whoredom. And Israel is defiled: Israel here is Ephraim; and when Israel is said to be polluted, it is to be understood both of spiritual and corporal pollution, which mostly are linked together, and draw on each other.