For they prepare their heart like an oven while they lie in wait; all night their anger smolders; in the morning it blazes like a flaming fire.
Here the Prophet says, that the Israelites did secretly, and by hidden means, prepare their hearts for deeds of evil; and he takes up nearly the same similitude as he did a little while before, though for a different purpose; for he says that they had prepared their hearts secretly, as the baker puts fire in the night in his oven, and then rests, and...
Some take away the last words of the foregoing chapter, and make them the beginning of this: "When I returned, or would have returned, the captivity of my people, when I was about to come towards them in ways of mercy, even when I would have healed Israel, then the iniquity of Ephraim (the country and common people) was discovered, and the wickedness of Samaria...
Commenting on Hosea 7:1-7
For they have made ready their heart like an oven, whiles they lie in wait,.... The prince, people, and scorners before mentioned, being heated with wine, and their lust enraged, they were ready for any wickedness; for the commission of adultery, lying in wait for their neighbours' wives to debauch them; or for rebellion and treason against their king, and even the murder of him...