Divrei Hayamim 58:15

וַיַּאַסְפ֤וּ אֶת־אֲחֵיהֶם֙ וַיִּֽתְקַדְּשׁ֔וּ וַיָּבֹ֥אוּ כְמִצְוַת־הַמֶּ֖לֶךְ בְּדִבְרֵ֣י יְהֹוָ֑ה לְטַהֵ֖ר בֵּ֥ית יְהֹוָֽה׃

And they gathered their brethren, and sanctified themselves, and came, according to the commandment of the king, by the words of the Lord, to cleanse the house of the Lord.