and have authority to cast out demons.
In these verses, we have, I. The choice Christ made of the twelve apostles to be his constant followers and attendants, and to be sent abroad as there was occasion, to preach the gospel. Observe, 1. The introduction to this call or promotion of disciples; He goes up into a mountain, and his errand thither was to pray.
Commenting on Mark 3:13-21
And to have power to heal sicknesses,.... All manner of corporeal diseases that attend men and women: and to cast out devils; from such who were possessed with them: that is, he chose and appointed them to be his apostles, with a view of conferring such powers upon them hereafter; for as yet, they were not vested with them, nor sent out to exercise them...
To have power to heal - and to cast out devils - The business of a minister of Christ is, 1st. To preach the Gospel. 2dly. To be the physician of souls. And, 3dly. To wage war with the devil, and destroy his kingdom.