2John

2John 1:10-11
"If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him, for he who greets him shares in his evil deeds."
Initially I was wondering why are these verses so harsh to those who do not bring the doctrine until I read from NLT study bible.

The translation is as such:
"If anyone comes to your meeting and does not teach the truth about Christ, don't invite that person into your house or give any kind of encouragement. Anyone who encourages such people becomes a partner in their evil work."
John is against those who are opposing God, he did not condemn hospitality to unbelievers. By inviting these false teachers into our house, we are indirectly agreeing to their teaching and allowing them to share with us, thus approving their work in another way. A false teacher is an unbeliever too, but within this unbeliever, there is a spirit of error. They lead others away from the truth. This is serious because they are against the work of God.