And he called unto him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits; By two and two - That they might encourage and support each other; and to show that union among the ministers of the Gospel is essential to the promotion of the cause of truth. See on Luke 10:1 (note).
Related Commentaries of Mark 6:7
Mark 6:7
7 And he called unto him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits;