The King James Bible addresses friendship in several passages:
Proverbs 17:17 (KJV)
17 A friend loveth at all times, and a brother is born for adversity.
Proverbs 18:24 (KJV)
24 A man that hath friends must shew himself friendly: and there is a friend that sticketh closer than a brother.
Proverbs 27:17 (KJV)
17 Iron sharpeneth iron; so a man sharpeneth the countenance of his friend.
John 15:13 (KJV)
13 Greater love hath no man than this, that a man lay down his life for his friends.
Ecclesiastes 4:9-10 (KJV)
9 Two are better than one; because they have a good reward for their labour. 10 For if they fall, the one will lift up his fellow: but woe to him that is alone when he falleth; for he hath not another to help him up.