1. He must tell them what was their duty, what was the good which the Lord their God required of them, v. 3. They must take care, (1.) That they do all the good they can with the power they have. They must do justice in defence of those that were injured, and must deliver the spoiled out of the hand of their oppressors. This was the duty of their place, Ps. lxxxii. 3. Herein they must be ministers of God for good. (2.) That they do no hurt with it, no wrong, no violence. That is the greatest wrong and violence which is done under colour of law and justice, and by those whose business it is to punish and protect from wrong and violence. They must do no wrong to the stranger, fatherless, and widow; for these God does in a particular matter patronise and take under his tuition, Exod. xxii. 21, 22.