John Gill Commentary 2 Chronicles 19:9

"And he charged them, saying, Thus shall ye do in the fear of Jehovah, faithfully, and with a perfect heart." — 2 Chronicles 19:9 (ASV)

And he charged them
The members of the court at Jerusalem:

saying, thus shall you do in the fear of the Lord, faithfully, and with
a perfect heart ;
judge righteously and impartially, as men fearing God, true to the trust reposed in them, and sincere and upright in heart and actions, having nothing else in view but the glory of God, and the good of men.