https://www.btstories.com/calling-the-twelve/

One evening, Jesus left the crowd and went up a mountain. He wanted to be alone so he could talk with the Father. He prayed the entire night.

At daybreak, he came down and called a select group of disciples to himself. These were to stay with him so he could teach them and prepare them to preach. He gave them power to heal the sick and cast out demons.