Rom 14:1-4:
Now accept the one who is weak in faith, but not for the purpose of passing judgment on his opinions.
One person has faith that he may eat all things, but he who is weak eats vegetables only.
The one who eats is not to regard with contempt the one who does not eat, and the one who does not eat is not to judge the one who eats, for God has accepted him.
Who are you to judge the servant of another? To his own master he stands or falls;
and he will stand, for the Lord is able to make him stand.
See also:
Are you sure?