וַיַּ֨רְא אֶפְרַ֜יִם אֶת־חָלְי֗וֹ וִֽיהוּדָה֙ אֶת־מְזֹר֔וֹ וַיֵּ֤לֶךְ אֶפְרַ֙יִם֙ אֶל־אַשּׁ֔וּר וַיִּשְׁלַ֖ח אֶל־מֶ֣לֶךְ יָרֵ֑ב וְה֗וּא לֹ֤א יוּכַל֙ לִרְפֹּ֣א לָכֶ֔ם וְלֹֽא־יִגְהֶ֥ה מִכֶּ֖ם מָזֽוֹר׃
And when Ephraim saw his sickness, And Judah his wound, Ephraim went to Assyria, And sent to King Contentious; But he is not able to heal you, Neither shall he cure you of your wound.
Rashi on Hosea
and Ephraim went to Assyria This is Hosea son of Elah, who was his vassal and then rebelled against him (II Kings 17:4).