Albert Barnes Commentary Hosea 8:3

"Israel hath cast off that which is good: the enemy shall pursue him." — Hosea 8:3 (ASV)

Israel has cast off the thing that is good - Or (since the word means "to cast off with abhorrence") Israel has cast off and abhorred Good, both Him who is Good and that which is good. The word tob includes both.

They rejected good in rejecting God, "Who is simply, supremely, wholly, universally good, and good to all, the Author and Fountain of all good, so that there is nothing simply good but God; nothing worthy of that title, except in respect of His relation to Him who is good and doing good" (Psalms 119:68).

So then whatever any man has or enjoys of good, is from his relation to Him, his nearness to Him, his congruity with Him. The drawing near to God is good to me (Psalms 73:28). All that any man has of good is from his being near to God, and his being, as far as human condition is capable, like Him. So that those who are far from Him, and put Him far from them, necessarily cast off all that is good.

The enemy shall pursue him - "Forsaking God, and forsaken by Him, they must necessarily be laid open to all evils." The enemy, that is, the Assyrian, shall pursue him. This is according to the curse, denounced against them in the law, if they should forsake the Lord, and break His covenant, and not hearken to His voice to observe to do His commandments (Deuteronomy 28:15–25).