Translations
They gathered their fellow Levites, consecrated themselves, and entered according to the king's command — and by the word of Yahweh — to cleanse the House of Yahweh.
They gathered their brothers and consecrated themselves, then entered according to the king's command — by the words of YHWH — to cleanse the House of YHWH.
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.
When they had assembled their brothers and consecrated themselves, they went in to cleanse the house of the LORD, according to the command of the king by the words of the LORD.

