In the Bible, Jesus gave Judas a piece of bread dipped in wine during the Last Supper as a symbolic gesture. This act was a sign to identify Judas as the one who would betray Jesus. It was a way for Jesus to reveal to his disciples that one of them would betray him, fulfilling the prophecy that was foretold in the scriptures. This act also served as a final warning to Judas to reconsider his actions and turn away from his betrayal.