Who teach: That true believers and regenerate can sin the sin unto death or against the Holy Spirit.

Since the same apostle John, after having spoken in the fifth chapter of his first epistle, vs.16 and 17, of those who sin unto death and having forbidden to pray for them, immediately adds to this in vs.18: We know that whosoever is begotten of God sinneth not (meaning a sin of that character), but he that was begotten of God keepeth himself, and the evil one toucheth him not (1 John 5:18).