1 Corinthians 8:7

8:7 But this knowledge is not shared by all. And some, by being accustomed to idols in former times, eat this food as an idol sacrifice, and their conscience, because it is weak, is defiled.

1 Corinthians 9:22

9:22 To the weak I became weak in order to gain the weak. I have become all things to all people, so that by all means I may save some.