Mark 3:12-15 New American Bible, Revised Edition (NABRE)

12. He warned them sternly not to make him known.

13. He went up the mountain and summoned those whom he wanted and they came to him.

14. He appointed twelve [whom he also named apostles] that they might be with him and he might send them forth to preach

15. and to have authority to drive out demons:

Mark 3