Leviticus 5:1 "If a person sins because he does not speak up when he hears a public charge to testify regarding something he has seen or learned about, he will be held responsible."
Numbers 15:30-31 "But anyone who sins defiantly, whether native-born or alien, blasphemes the Lord, and that person must be cut off from his people. Because he has despised the Lord's word and broken His commands, that person must surely be cut off; his guilt remains on him."

1 Corinthians 5:11 "But actually, I wrote to you not to associate with any so-called brother if he is an immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler - not even to eat with such a one.

I was wondering if anyone saw a connection between the OT passages and the NT passage. It almost looks like the 1 Cor. verse is the NT principle from the OT verses. It's interesting to me that it requires someone to testify even when they learn about it, not just when someone sees it. God's word is always good, it's not always easy to follow, yet when it is obeyed, the reward is great.