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;
Rashi on II Chronicles
And beside him Heb. וְעַל יָדוֹ beside him; an example is (II Sam. 14:30): “Joab’s field is adjoining mine (אֶל יָדִי).”
Rashi on II Chronicles
who gave generously to the Lord - Heb. הַמִּתְנַדֵּב. An example is (Jud. 5:2) “when the people offer themselves willingly (בְּהִתְנַדֵּב עַם), bless the Lord”