13 Afterward Jesus went up on a mountain and called out the ones he wanted to go with him. And they came to him. 14 Then he appointed twelve of them and called them his apostles. They were to accompany him, and he would send them out to preach, 15 giving them authority to cast out demons. 16 These are the twelve he chose: Simon (whom he named Peter), 17 James and John (the sons of Zebedee, but Jesus nicknamed them "Sons of Thunder" ), 18 Andrew, Philip, Bartholomew, Matthew, Thomas, James (son of Alphaeus), Thaddaeus, Simon (the zealot ), 19 Judas Iscariot (who later betrayed him).
Matthew Henry's Commentary on Mark 3:13-19
Commentary on Mark 3:13-21
(Read Mark 3:13-21)
Christ calls whom he will; for his grace is his own. He had called the apostles to separate themselves from the crowd, and they came unto him. He now gave them power to heal sicknesses, and to cast out devils. May the Lord send forth more and more of those who have been with him, and have learned of him to preach his gospel, to be instruments in his blessed work. Those whose hearts are enlarged in the work of God, can easily bear with what is inconvenient to themselves, and will rather lose a meal than an opportunity of doing good. Those who go on with zeal in the work of God, must expect hinderances, both from the hatred of enemies, and mistaken affections of friends, and need to guard against both.