A froward man soweth strife: and a whisperer separateth chief friends.
Proverbs 18:24A man that hath friends must shew himself friendly: and there is a friend that sticketh closer than a brother.
Proverbs 27:17Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.
1 Corinthians 15:33Be not deceived: evil communications corrupt good manners.