Musar do Samuela I 7:3

Now that it has been explained that the pillars of love are three and we have explained each of them briefly, we can now say that the foundation of the book and its intent is a service in which man can reach the level of fulfilling God’s will till he purifies his heart from its wickedness and cleanses it from its uncleanliness. Then his heart will cleave to the service of God. It is like a garment which you wish to dye. If it is soiled, then the dye will not be fast until you first wash it well and remove all of its stains; then the dye will be fast. Concerning this, Isaiah, the prophet, peace be upon him, said (Isaiah 55:7), “Let the wicked forsake his way, and the man of iniquity his thoughts; and let him return unto the Lord, and He will have compassion upon him, and let him return to our God, for He will abundantly pardon.” And Samuel the prophet said (1 Samuel 7:3), “If ye do return unto the Lord with all your heart, then put away the foreign gods from among you.”