John Gill Commentary 2 Chronicles 19:10

"And whensoever any controversy shall come to you from your brethren that dwell in their cities, between blood and blood, between law and commandment, statutes and ordinances, ye shall warn them, that they be not guilty towards Jehovah, and so wrath come upon you and upon your brethren: this do, and ye shall not be guilty." — 2 Chronicles 19:10 (ASV)

And what cause soever shall come to you of your brethren
that dwell in their cities
Whether sacred or civil, that should come before them by way of appeal from, inferior courts in the country, where they could not be determined:

between blood and blood ;
one relation and another, or with respect to shedding of blood, whether ignorantly or purposely:

between law and commandment, statutes and judgments ;
not rightly understood, and so pleaded on both sides:

you shall even warn them that they trespass not against the Lord ;
the persons engaged in controversy, that they take no false oath, nor bear false testimony, and act not stubbornly against any of the laws, when explained in court to them:

and so wrath come upon you and your children ;
upon judges for the neglect of their duty in giving due warning, and upon the people for not taking it when given:

this do, and you shall not trespass ;
if the above charge in all its parts is strictly attended to.