וַיֹּ֖אמֶר מִיכָ֑יְהוּ חַי־יְהוָ֕ה כִּ֛י אֶת־אֲשֶׁר־יֹאמַ֥ר אֱלֹהַ֖י אֹת֥וֹ אֲדַבֵּֽר׃
And Micaiah said: ‘As the LORD liveth, what my God saith, that will I speak.’
Read midrashic interpretation of II Chronicles 18:13: and classical rabbinic exegesis.