Truly to the pure all things are pure, but to those who are defiled and unbelieving nothing is pure, but both their mind and their conscience are defiled.
Nevertheless the knowledge is not in all men, but some, with conscience of the idol until now, eat as sacrificed to idols, and their weak conscience is defiled.
Then Haggai said, If a man who is unclean because of a dead body touches any of these, shall it be unclean? And the priests answered and said, It shall be unclean.
how much more the blood of Christ, who, through the eternal Spirit, offered himself unblemished to God, will cleanse your conscience from dead works in order to serve a living God?
Looking carefully lest any man fall short, away from the grace of God, lest any root of bitterness sprouting up would cause trouble, and by this many may be defiled,