Proverbs 17:18
"A man void of understanding striketh hands, and becometh surety in the presence of his friend."
Cross References (ranked by relevance)
Proverbs 11:15
He that is surety for a stranger shall smart for it: and he that hateth suretiship is sure.
Proverbs 20:16
Take his garment that is surety for a stranger: and take a pledge of him for a strange woman.
Proverbs 22:16
He that oppresseth the poor to increase his riches, and he that giveth to the rich, shall surely come to want.