וַיֹּאמֶר֩ יְהוָ֨ה ל֜וֹ ע֗וֹד הָֽבֵא־נָ֤א יָֽדְךָ֙ בְּחֵיקֶ֔ךָ וַיָּבֵ֥א יָד֖וֹ בְּחֵיק֑וֹ וַיּ֣וֹצִאָ֔הּ וְהִנֵּ֥ה יָד֖וֹ מְצֹרַ֥עַת כַּשָּֽׁלֶג׃
Targum Jonathan on Exodus
And the Lord said to him again, Put now thy hand within thy breast (Choba); and he put it within his breast, and withdrew it, and, behold, his hand was leprous, it was white as snow.