Now look at 1 John 1:7 about sins not unto death. While walking in the Spirit/Light after all our sins unto death have been taken away from our nature (1 John 3:5) and He's made us righteous (not holy yet where we never stumble even unintentionally, 2 Peter 1:5-11) the unintentional slight imperfections still abhorrent to the perfect Father, Jesus as our Advocate, still cleanses them as He is still in the process of maturing every one of the fruit of the Spirit, just as He cleansed sins unto death from us before we repented as one in the unsaved world. As the Finisher of our faith, even those He will complete, Phil. 1:6.
1 John 1:7 shows also we now have fellowship with the Father because of the complete cleansing from Jesus and His powerful blood. This is not talking about recommitting a sin unto death. In fact, in 1 John 5:16-17 we are not even suppose to pray for a brother or sister that has gone back to sins unto death. Because we still have free will, those sins are willful disobedience, not slight imperfections. Read Hebrews 10:26-31. I've heard many false teachers even try to twist that passage to being only to Jews. Nope! It is our apostasy. Hebrews 6:4 For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, 5 and have tasted the good word of God and the powers of the age to come, 6 if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.:
This problem with misunderstanding the two types of sin started in the Reformation when instead of teaching what I just explained, they lumped the two types of sin together in the doctrine, "sin is sin." And even though there is no such thing as a real doctrine of sinless perfection, righteousness is sinlessness of only sins unto death, and holiness is perfection of even slight imperfections from immature fruit of the Spirit. Only after that (Phil. 1:6) could we ever say we are in a state of "sinless perfection."
For further study on these two types go back to our schoolmaster and study Numbers 15:22-36 about sins not unto death first, and then notice there was no sacrifice for sins unto death for God's people.