וַיֹּ֣אמֶר מִיכָ֔ה עַתָּ֣ה יָדַ֔עְתִּי כִּֽי־יֵיטִ֥יב יְהוָ֖ה לִ֑י כִּ֧י הָיָה־לִ֛י הַלֵּוִ֖י לְכֹהֵֽן׃
Then said Micah: ‘Now know I that the LORD will do me good, seeing I have a Levite as my priest.’
Read midrashic interpretation of Judges 17:13: and classical rabbinic exegesis.