Final answer:
After Judas and Jesus die, Matthias was elected by the 120 people to replace Judas as the 12th apostle.
Step-by-step explanation:
After the death of Judas, the remaining eleven apostles gathered together and decided to choose a replacement for Judas. According to the Bible, they cast lots and Matthias was elected as the 12th apostle to replace Judas. The event is mentioned in the book of Acts in the New Testament.