Romans 14:23

and he who is making a difference, if he may eat, hath been condemned, because it is not of faith; and all that is not of faith is sin.

Romans 13:2

so that he who is setting himself against the authority, against God's ordinance hath resisted; and those resisting, to themselves shall receive judgment.

1 Corinthians 8:7

but not in all men is the knowledge, and certain with conscience of the idol, till now, as a thing sacrificed to an idol do eat it, and their conscience, being weak, is defiled.

1 Corinthians 11:29-31

for he who is eating and drinking unworthily, judgment to himself he doth eat and drink -- not discerning the body of the Lord.

Romans 14:5

One doth judge one day above another, and another doth judge every day alike; let each in his own mind be fully assured.

Titus 1:15

all things, indeed, are pure to the pure, and to the defiled and unstedfast is nothing pure, but of them defiled are even the mind and the conscience;

Hebrews 11:6

and apart from faith it is impossible to please well, for it behoveth him who is coming to God to believe that He is, and to those seeking Him He becometh a rewarder.

Treasury of Scripture Knowledge

Summary

And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.

Bible References

He that

1 Corinthians 8:7
but not in all men is the knowledge, and certain with conscience of the idol, till now, as a thing sacrificed to an idol do eat it, and their conscience, being weak, is defiled.

Damned

Romans 13:2
so that he who is setting himself against the authority, against God's ordinance hath resisted; and those resisting, to themselves shall receive judgment.
1 Corinthians 11:29
for he who is eating and drinking unworthily, judgment to himself he doth eat and drink -- not discerning the body of the Lord.

Whatsoever

Titus 1:15
all things, indeed, are pure to the pure, and to the defiled and unstedfast is nothing pure, but of them defiled are even the mind and the conscience;
Hebrews 11:6
and apart from faith it is impossible to please well, for it behoveth him who is coming to God to believe that He is, and to those seeking Him He becometh a rewarder.