In these verses, Jesus goes out to a mountain to pray and spends the entire night in prayer to God. The next morning, He calls His followers and chooses twelve of them, whom He also designates as apostles.
It reads in Luke 6:12-16 EASY>
A few days later, Jesus went out to a mountain to pray. He stayed there all night praying to God. The next morning, he called his followers. He chose twelve of them and called them apostles. These are the ones he chose: Simon (Jesus named him Peter), Andrew, brother of Peter, James, John, Philip, Bartholomew, Matthew, Thomas, James, the son of Alphaeus, Simon, called the Zealot, Judas, the son of James, Judas Iscariot (the one who turned against Jesus).