"with a smile that Judas in hell might be proud of"
The Judas Kiss, Gustave Doré, 19th century
Public DomainThe Judas Kiss, Gustave Doré, 19th century - Credit: wikimedia commons

 Judas was one of Jesus Christ’s disciples, best known for betraying him into the hands of the chief priests by identifying him with a kiss.

The name ‘Judas’ is now often used as a synonym for ‘traitor’ or ‘betrayer.’