הושע ז:ו פירוש: רש״י

For they have made ready their heart like an oven with their ambush They prepared and readied their heart with their ambush, like an oven which they prepare and heat in order to bake.

all night their baker sleeps Their baker, who heats the oven after they have prepared their heart and have thought of the execution of the evil, how they would do it.

their baker sleeps i.e., until morning they sleep, and in the morning they burn like fire until they consummate their evil.