<p>3:15 <em>And to have authority to cast out demons- </em>This is in the context of the Lord's concern that the crowds were sheep with no shepherd, which I suggested was an allusion to Moses' words of Num. 27:17 (see on Mt. 9:36). Moses asks for God to raise up another to do his work, and God gives him Joshua- and is told &quot;You shall invest him with some of your authority&quot; (Num. 27:20). So the Lord is here treating the disciples as if they are His replacement, going out to do His work, just as the later body of Christ are to do. We have in this preaching tour they are sent on some sort of foretaste of the great commission.</p>