Romans 14: 4-5

"Let not him who eats despite him who abstains, and let not him who abstains pass judgment on him who eats; for God has welcomed him. Who are you to pass judgment on the servant of another? It is before his own master that he stands or falls. And he will be upheld, for the Master is able to make him stand."

Romans 14: 22-3
The faith that you have, keep between yourself and God; happy is he who has no reason to judge himself for what he approves. But he who has doubts is condemned, if he eats, because he does not act from faith; for whatever does not proceed from faith is sin."