Now therefore listen to the word of Yahweh: 'You say, Don't prophesy against Israel, and don't preach against the house of Isaac.'
and drop not [thy word] against the house of Isaac; say nothing against it, though in ever so soft and gentle a manner: it designs the same thing as before, only in different words; and is a prohibition of the prophet to prophesy against the ten tribes that descended from Isaac, in the line of Jacob. So the Targum paraphrases it,