Enguos means a surety or guarantor — a person who stands as security for another, pledging their own resources or freedom if the other fails to pay. It appears once in the New Testament (Hebrews 7:22), where Jesus is called the enguos of a better covenant.
The application of enguos to Jesus in Hebrews 7:22 is one of the New Testament's most legally precise christological titles. A guarantor in antiquity was personally liable — if the debtor defaulted, the guarantor paid. Jesus, by becoming the surety of the new covenant, pledged Himself to fulfill every obligation of that covenant on behalf of humanity. His eternal priesthood (Hebrews 7:24) ensures the covenant never fails. Unlike the Levitical priests who died and were replaced, Jesus 'always lives to intercede' (Hebrews 7:25). The guarantee is permanent, personal, and infinite.