וַיִּ֣פֶן אֵלָ֡יו עֲזַרְיָהוּ֩ כֹהֵ֨ן הָרֹ֜אשׁ וְכָל־הַכֹּהֲנִ֗ים וְהִנֵּה־ה֤וּא מְצֹרָע֙ בְּמִצְח֔וֹ וַיַּבְהִל֖וּהוּ מִשָּׁ֑ם וְגַם־הוּא֙ נִדְחַ֣ף לָצֵ֔את כִּ֥י נִגְּע֖וֹ יְהוָֽה׃
And Azariah the chief priest, and all the priests, looked upon him, and, behold, he was leprous in his forehead, and they thrust him out quickly from thence; yea, himself made haste also to go out, because the LORD had smitten him.
Read halakhic rulings (Jewish law) on II Chronicles 26:20: and classical halakhic sources.