Romans 14:1-3

As for the one whose faith is weak, accept him [into your fellowship], but not for [the purpose of] quarreling over his opinions. One man’s faith permits him to eat everything, while the weak believer eats only vegetables [to avoid eating ritually unclean meat or something previously considered unclean]. The one who eats [everything] is not to look down on the one who does not eat, and the one who does not eat must not criticize or pass judgment on the one who eats [everything], for God has accepted him.