Romans 14:23

But he who has misgivings and yet eats meat is condemned already, because his conduct is not based on faith; for all conduct not based on faith is sinful.

Romans 13:2

Therefore the man who rebels against his ruler is resisting God's will; and those who thus resist will bring punishment upon themselves.

1 Corinthians 8:7

But all believers do not recognize these facts. Some, from force of habit in relation to the idol, even now eat idol sacrifices as such, and their consciences, being but weak, are polluted.

1 Corinthians 11:29-31

For any one who eats and drinks, eats and drinks judgement to himself, if he fails to estimate the body aright.

Romans 14:5

One man esteems one day more highly than another; another esteems all days alike. Let every one be thoroughly convinced in his own mind.

Titus 1:15

To the pure everything is pure; but to the polluted and unbelieving nothing is pure, but on the contrary their very minds and consciences are polluted.

Hebrews 11:6

But where there is no faith it is impossible truly to please Him; for the man who draws near to God must believe that there is a God and that He proves Himself a rewarder of those who earnestly try to find Him.

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 all believers do not recognize these facts. Some, from force of habit in relation to the idol, even now eat idol sacrifices as such, and their consciences, being but weak, are polluted.

Damned

Romans 13:2
Therefore the man who rebels against his ruler is resisting God's will; and those who thus resist will bring punishment upon themselves.
1 Corinthians 11:29
For any one who eats and drinks, eats and drinks judgement to himself, if he fails to estimate the body aright.

Whatsoever

Titus 1:15
To the pure everything is pure; but to the polluted and unbelieving nothing is pure, but on the contrary their very minds and consciences are polluted.
Hebrews 11:6
But where there is no faith it is impossible truly to please Him; for the man who draws near to God must believe that there is a God and that He proves Himself a rewarder of those who earnestly try to find Him.