John Chrysostom
After instructing, "Pray to the Lord of the harvest" (Matthew 9:38), He Himself immediately designates them to this role without them needing to ask or pray, reminding them of what John spoke regarding the threshing floor, the shovel, the tares, and the wheat. It becomes clear that He is the Creator, the Lord of the harvest, and the Lord of the prophets. If He dispatched them to gather, it was definitely not with a foreign seed, but rather what He had planted through the prophets. Not only did He motivate them by labeling their task as a harvest, but He also empowered them for this mission. However, the Spirit had not yet been bestowed: the Holy Spirit was not present with them since Jesus had not yet been glorified (John 7:39). How did they cast out spirits?
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Through the command and authority of Christ. Notice, then, the appropriateness of this mission. He did not send them out at the outset, but only after they had faithfully followed Him for a significant time and had witnessed His miracles—raising the dead, calming the sea, expelling demons, healing the paralyzed, forgiving sins, and cleansing lepers. Once they were sufficiently assured of His might, both in action and in teaching, He commissions them; He does not send them into perilous tasks—there was no threat in Palestine at that time—they only faced the potential for criticism. Yet, He does forewarn them about coming challenges, preparing them in advance and helping them adjust through frequent reminders.