Who betrayed Jesus?

Answer: Judas

Judas Iscariot betrayed Jesus.

“While Jesus was still speaking, Judas, one of the Twelve, arrived, accompanied by a large crowd armed with swords and clubs, sent from the chief priests and elders of the people. Now the betrayer had arranged a signal with them: “The One I kiss is the man; arrest Him.””— Matthew 26:47-48 (BSB)