One who has no judgment guarantees another person’s debt or puts up security for a friend. (Proverbs 17:18)

To become surety for another person is to co-sign for his debt. It is to place yourself under legal and financial obligation for what someone else owes. You carry his responsibility and share his risk.

Scripture does not present this as an act of generosity. Proverbs repeatedly warns against co-signing, describing it as a foolish and dangerous decision that leads into a trap. “Do not be one of those who shakes hands in a pledge, one of those who is surety for debts. If you have nothing with which to pay, why should he take away your bed from under you?” This is not merely advice, but a biblical command grounded in reason. 

A person who guarantees another’s debt is no longer free. He binds himself to another man’s obligation, making himself subject to that man’s decisions, responsibility, and circumstances. Scripture calls this a snare, whether the borrower is a friend or a stranger: “My son, if you have put up security for your neighbor, if you have give your pledge for a stranger…you are snared by the words of your mouth.” In contrast, “One who hates being surety is secure.” The biblical position is a total rejection of the practice.

If someone has already co-signed, Scripture urges immediate escape: “So do this, my son, to free yourself, since you have fallen into your neighbor’s hands: Go, humble yourself, and plead with your neighbor. Allow no sleep to your eyes, no slumber to your eyelids. Escape like a gazelle from a hunter, like a bird from a hunter’s trap.” He should repent, and seek release from the agreement without delay.

Some confuse co-signing with generosity or lending to the poor. Others feel pressure from friends or family and justify it as an act of love. But Scripture does not treat this as a matter of compassion. Guaranteeing another person’s debt is not mercy, but a presumptuous departure from wisdom. It disregards God’s instruction and exposes both the individual and his household to harm.

The only surety that Scripture honors is Christ. He took on the debt of sinners by divine appointment. However, unlike a human surety, he did not act as a mere backup in case of failure. He stepped forward and paid the full price. His role as surety might appear foolish to those who are perishing, but to those who believe, he is the wisdom and power of God.