Stand with anybody that stands right. Stand with him while he is right, and part with him when he goes wrong. (Abraham Lincoln)
It really feels great to have friends who stand with us in the hard times. We want to stand with them, too. But, no matter how close, when our friends go in wrong directions and make poor choices we should no longer stand with them. Our choice, then, is to warn them with concern and lovingly try to help them make right decisions. To do so is to stand strong.
Bad company corrupts good character (1 Corinthians 15:33). If someone is caught in a sin, you who live by the Spirit should restore that person gently (Galatians 6:1).