Welcome those who are weak in faith, but not for the purpose of quarreling over opinions.
References for Romans 14:1
Some believe in eating anything, while the weak eat only vegetables.
Those who eat must not despise those who abstain, and those who abstain must not pass judgment on those who eat; for God has welcomed them.
Who are you to pass judgment on servants of another? It is before their own lord that they stand or fall. And they will be upheld, for the Lord is able to make them stand.
References for Romans 14:4
Some judge one day to be better than another, while others judge all days to be alike. Let all be fully convinced in their own minds.
Those who observe the day, observe it in honor of the Lord. Also those who eat, eat in honor of the Lord, since they give thanks to God; while those who abstain, abstain in honor of the Lord and give thanks to God.