Reference for II Chronicles 15:10

וַיִּקָּבְצ֥וּ יְרוּשָׁלִַ֖ם בַּחֹ֣דֶשׁ הַשְּׁלִישִׁ֑י לִשְׁנַ֥ת חֲמֵשׁ־עֶשְׂרֵ֖ה לְמַלְכ֥וּת אָסָֽא׃

So they gathered themselves together at Jerusalem in the third month, in the fifteenth year of the reign of Asa.