What does Isaiah 1:19 mean?

The Lord has urged His people Israel to stop their meaningless worship rituals and to change the direction of their lives. He wants them to clean themselves by stopping their evil practices and beginning to do the good work of taking care of the disadvantaged living among them. If they will do this, the Lord has said, their blood-red stains of sin can become as white as snow (Isaiah 1:18).

Though the Lord is clear in his instructions. This will require the Israelites to be intentional about how they live. They must be wholehearted participants in pursing to obey Him. If they do so, He will bring prosperity to them. He will give them all they need, including safety and security from their enemies. The opposite choice will bring starkly different consequences (Isaiah 1:20) .