A different kind of security. In biblical times, if a person was unable to pay his debt, the consequences could be serious. The whole family could be sold into slavery. If someone put up “security” for another person, he promised to pay that person’s debt if he was unable to do so himself. Proverbs teaches that putting up security for another person is generally unwise, since those who do so risk losing everything if the other person cannot pay his debt (11:15).