The Holy Spirit also testifies1 to us about this. First he says:
References for Hebrews 10:15
"This is the covenant I will make with them after that time, says the Lord. I will put my laws in their hearts, and I will write them on their minds."2
References for Hebrews 10:16
Then he adds: "Their sins and lawless acts I will remember no more."3
References for Hebrews 10:17
And where these have been forgiven, there is no longer any sacrifice for sin.