וַיִּוָּעַ֨ץ הַמֶּ֧לֶךְ וְשָׂרָ֛יו וְכָל־הַקָּהָ֖ל בִּירוּשָׁלִָ֑ם לַעֲשׂ֥וֹת הַפֶּ֖סַח בַּחֹ֥דֶשׁ הַשֵּׁנִֽי׃
For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.
Read midrashic interpretation of II Chronicles 30:2: and classical rabbinic exegesis.