Proverbs 18:24
"A man that hath friends must shew himself friendly: and there is a friend that sticketh closer than a brother."
Cross References (ranked by relevance)
A friend loveth at all times, and a brother is born for adversity.
Ointment and perfume rejoice the heart: so doth the sweetness of a man’s friend by hearty counsel.
I am distressed for thee, my brother Jonathan: very pleasant hast thou been unto me: thy love to me was wonderful, passing the love of women.
But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the LORD’s oath that was between them, between David and Jonathan the son of Saul.
And Absalom said to Hushai, Is this thy kindness to thy friend? why wentest thou not with thy friend?