12 Also in Judah the hand of God was on the people to give them unity of mind to carry out what the king and his officials had ordered, following the word of the LORD.

Read 2 Chronicles 30:12 Using Other Translations

Also in Judah the hand of God was to give them one heart to do the commandment of the king and of the princes, by the word of the LORD.
The hand of God was also on Judah to give them one heart to do what the king and the princes commanded by the word of the LORD.
At the same time, God’s hand was on the people in the land of Judah, giving them all one heart to obey the orders of the king and his officials, who were following the word of the LORD .