1 Corinthians 8:9 – 11
New International Version (NIV)
9 Be careful, however, that the exercise of your rights does not become a stumbling block( to the weak. 10 For if someone with a weak conscience sees you, with all your knowledge, eating in an idol’s temple, won’t that person be emboldened to eat what is sacrificed to idols? 11 So this weak brother or sister, for whom Christ died, is destroyed by your knowledge.
From BibleGateway.com: http://www.biblegateway.com/passage/?search=1 Corinthians 8:9-11&version=NIV
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