"Stumbling" in the Bible: Romans 14:13-14;
In Romans, Paul urges us to not place stumbling blocks in one another's way. We shouldn't judge one another. He goes on to say that specifically there is no food that is unclean for all. Instead, if you personally count it as unclean, then it is unclean to you.
http://biblegateway.com/passage/?search=Romans%2014:13-14&version=NIV