וַֽיְמַהֲר֗וּ וַיִּקְחוּ֙ אִ֣ישׁ בִּגְד֔וֹ וַיָּשִׂ֥ימוּ תַחְתָּ֖יו אֶל־גֶּ֣רֶם הַֽמַּעֲל֑וֹת וַֽיִּתְקְעוּ֙ בַּשּׁוֹפָ֔ר וַיֹּאמְר֖וּ מָלַ֥ךְ יֵהֽוּא׃
Then they hastened, and took every man his garment, and put it under him on the top of the stairs, and blew the horn, saying: ‘Jehu is king.’
Read midrashic interpretation of II Kings 9:13: and classical rabbinic exegesis.