“For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries. Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses.
Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace? For we know Him who said, “Vengeance is Mine; I will repay, says the Lord.” And again, “The Lord will judge His people.” It is a fearful thing to fall into the hands of the living God.” (Hebrews 10:26-31)
That’s exactly what Catholics do by claiming there need to be works added.
I have seen Protestants pronounce that once they proclaim their own salvation then all sins, even unrepented sins, from that point forward are washed away.
"If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God." - Heb 10:26-27