Romans 14:23 in the King James Version
And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.
Context
22 Do you have faith? Have it to yourself before God. Happy is he who doesn’t judge himself in that which he approves.
23 But he who doubts is condemned if he eats, because it isn’t of faith; and whatever is not of faith is sin.