II Chronicles 17:16 Midrash

וְעַל־יָדוֹ֙ עֲמַסְיָ֣ה בֶן־זִכְרִ֔י הַמִּתְנַדֵּ֖ב לַיהוָ֑ה וְעִמּ֛וֹ מָאתַ֥יִם אֶ֖לֶף גִּבּ֥וֹר חָֽיִל׃ (ס)

and next to him Amasiah the son of Zichri, who willingly offered himself unto the LORD, and with him two hundred thousand mighty men of valour;