Fellowship with Wrong

The Bible speaks of many with whom we are not to have fellowship:

Criminals

Proverbs 1:10-15 

10 My son, if sinners entice you, do not give in to them.

11 If they say, “Come along with us; let's lie in wait for someone's blood, let's waylay some harmless soul;

12 let’s swallow them alive, like the grave, and whole, like those who go down to the pit;

13 we will get all sorts of valuable things and fill our houses with plunder;

14 throw in your lot with us, and we will share a common purse”—

15 my son, do not go along with them, do not set foot on their paths;

The disorderly

2 Timothy 3:6 

They are the kind who worm their way into homes and gain control over weak-willed women, who are loaded down with sins and are swayed by all kinds of evil desires,

The disobedient

2 Timothy 3:14-15 

14 But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it,

15 and how from infancy you have known the holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus.

The Bible speaks of many with whom we are not to have fellowship:

The foolish

Proverbs 22:24 

Do not make friends with a hot-tempered man, do not associate with one easily angered,

Excommunicated church member

Matthew 18:17

If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, treat him as you would a pagan or a tax collector.