Proverbs 6:1-5
My son, if you have put up security for your neighbor, if you have struck hands in pledge with a stranger, . . .

Proverbs 11:15
He who puts up security for a stranger will surely suffer, but the one who hates indebtedness is secure.

Proverbs 17:18
A man lacking judgment strikes hands in pledge and puts up security for his neighbor.

Proverbs 27:13
Take the garment of him who posts security for a stranger; get collateral if it is for a wayward woman.