וַיִּשְׁמַ֗ע אֶל־תִּרְהָ֤קָה מֶֽלֶך־כּוּשׁ֙ לֵאמֹ֔ר הִנֵּ֥ה יָצָ֖א לְהִלָּחֵ֣ם אִתָּ֑ךְ וַיָּ֙שָׁב֙ וַיִּשְׁלַ֣ח מַלְאָכִ֔ים אֶל־חִזְקִיָּ֖הוּ לֵאמֹֽר׃
Rashi on II Kings
He again sent messengers. To notify him that he was not returning to his land, rather he was waging war with Cush, and then to return here.