Exodus 23:33

They shall not dwell in thy land, lest they make thee sin against Me; if they would remain in the land, their presence and their idolatrous customs would be a continual temptation to Israel, as the Lord well knew; for if thou serve their gods, it will surely be a snare unto thee. Even so, the intercourse of Christians with the children of this world all too often proves a snare to them, and they are lured into the idolatrous customs of the unbelievers. It is to our greatest advantage not to provoke the Lord at any time, lest He take His gracious presence from us. It is only by staying with Him that we are safe forever.