Roma 14:14

14:14 I know and am convinced in the Lord Jesus that there is nothing unclean in itself; still, it is unclean to the one who considers it unclean.

Roma 14:23

14:23 But the man who doubts is condemned if he eats, because he does not do so from faith, and whatever is not from faith is sin. ¹ 

[14:23]  ¹ tc Some mss insert 16:25-27 at this point. See the tc note at 16:25 for more information.