הִכְעִ֥יס אֶפְרַ֖יִם תַּמְרוּרִ֑ים וְדָמָיו֙ עָלָ֣יו יִטּ֔וֹשׁ וְחֶ֨רְפָּת֔וֹ יָשִׁ֥יב ל֖וֹ אֲדֹנָֽיו׃
Rashi on Hosea
Ephraim provoked his Creator by despising His prophets and betraying Him.
Rashi on Hosea
yea, bitterness (Heb. תַּמְרוּרִים,) they are to him for his blood which he shed by causing Israel to sin by clinging to idolatryand one who causes a person to sin is worse to him than one who kills him, as we learn from Ammon and Moab, who misled Israel to cling to Baal-Peor, and Scripture punished them more severely than an Egyptian and an Edomite, who drowned them in the river and went forth toward them with the sword...
Rashi on Hosea
shall be cast upon him The Holy One, blessed be He, shall cast it upon him.