וְרֹ֤אשׁ אֶפְרַ֙יִם֙ שֹׁמְר֔וֹן וְרֹ֥אשׁ שֹׁמְר֖וֹן בֶּן־רְמַלְיָ֑הוּ אִ֚ם לֹ֣א תַאֲמִ֔ינוּ כִּ֖י לֹ֥א תֵאָמֵֽנוּ׃ (ס)
And the head of Ephraim is Samaria, And the head of Samaria is Remaliah’s son. If ye will not have faith, surely ye shall not be established.’
Read midrashic interpretation of Isaiah 7:9: and classical rabbinic exegesis.