Mark 3:12-17

And he straitly charged them that they should not make him known. And he goeth up into a mountain, and calleth unto him whom he would: and they came unto him. And he ordained twelve, that they should be with him, and that he might send them forth to preach, and to have power to heal sicknesses, and to cast out devils: and Simon he surnamed Peter; and James the son of Zebedee, and John the brother of James; and he surnamed them Boanerges, which is, The sons of thunder