Book of Hosea Chapter 6 Vs. 10

 Israel and Judah Are Unrepentant

I have seen an horrible thing in the house of Israel: there is the whoredom of Ephraim, Israel is defiled. Hos. 6:10

I have seen... This phrase means Ephraim and Judah subsequently discriminated.

an horrible thing... The horrible thing refers to polluting idolatry. This peculiar word occurs again in Jeremiah. According to the punctuation of the Hebrew the reciter hesitates before pronouncing the horrible thing which grated through his teeth. Yea, crime have they done. In the house of Israel I have seen horrors: there Ephraim hath played the harlot: Israel is defiled-Judah as well.

there is the... In the house of Israel is the Whoredom of Jeroboam, who was of the tribe of Ephraim, and caused Israel to sin, to go a whoring after idols. Or the Whoredom of the tribe of Ephraim, which belonged to the house of Israel, and even of all the ten tribes. Both corporeal and spiritual Whoredom, or idolatry, are here meant.

Israel is defiled... With Whoredom of both kinds; it had spread itself all over the ten tribes. They were all infected with it, and polluted by it (see Hos. 5:3).

The horrible thing they had done was the worship of false gods. The Whoredom they had committed was spiritual adultery. As we will see in the next verse, these are all 12 tribes of Israel, which got caught up in idolatry, not just Ephraim. Ephraim is mentioned separately, because he received the right hand (spiritual), blessing from Jacob.

The nation’s sin is described in powerful figurative language. The widespread breach of covenant (Hos. 6:6-7) was a horrible thing. Jeremiah used a related term to describe rotten figs that are inedible (Jer. 29:17). Israel had become defiled by her prostitution, that is, her unfaithfulness to the Lord (cf. Hos. 5:3).