Romans 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.

Romans 14:20

14:20 Do not destroy the work of God for the sake of food. For although all things are clean, ¹  it is wrong to cause anyone to stumble by what you eat.

[14:20]  ¹ sn Here clean refers to food being ceremonially clean.