Do not hang out with the "wrong crowd"
A friend can add pain to one's life or bring upon joy. Choose friends that will make you stronger, better people, who will support you and enlighten your spirit. Beware of friends that will lead you on a path of self-destruction. Select friends with qualities you admire.
A righteous man is cautious in friendship, but the way of the wicked leads them astray. -Proverbs 12:26
Blessed is the man who walks not in the counsel of the ungodly. -Psalm 1:1
A man should choose a friend who is better than himself. There are plenty of acquaintances in the world; but very few real friends. - Chinese Proverb
In choosing a friend, go up a step. -Jewish Proverb