1. They must cease to do evil, must do no more wrong, shed no more innocent blood. This is the meaning of washing themselves and making themselves clean, v. 16. It is not only sorrowing for the sin they had committed, but breaking off the practice of it for the future, and mortifying all those vicious affections and dispositions which inclined them to it. Sin is defiling to the soul. Our business is to wash ourselves from it by repenting of it and turning from it to God. We must put away not only that evil of our doings which is before the eye of the world, by refraining from the gross acts of sin, but that which is before God's eyes, the roots and habits of sin, that are in our hearts; these must be crushed and mortified.