Matthew 15:2-5
"Why do your disciples transgress the tradition of the elders? For they do not wash their hands when they eat."
Luke 11:45-46
One of the lawyers answered him, "Teacher, by saying these things you reproach us also."
Romans 2:19-24
and if you are sure that you are a guide to the blind, a light to those who are in darkness,
Romans 14:21
It is right not to eat meat or drink wine or do anything that makes your brother stumble.
Hebrews 3:12
Take care, brethren, lest there be in any one of you an evil, unbelieving heart, leading you to fall away from the living God.