Pray you therefore the Lord of the harvest, that he will send forth laborers into his harvest.
All Commentaries on Matthew 9:38 Go To Matthew 9
He shows how great the gift is when he says, “Ask from the Lord of the harvest.” And in an inconspicuous manner Jesus indicates that he himself is the one who holds this authority. Then to signify how promising is the harvest, Jesus calls them to “pray therefore the Lord of the harvest.” In doing so he indirectly declares this lordship to be his own prerogative. For after having said, “pray therefore the Lord of the harvest” when they had not made any request or prayer, he himself at once appoints them, reminding them also of the sayings of John, about the threshing floor, the separation of the husks from the kernels of grain, the husks that are left over, and of the One who is winnowing. From this it is clear that he himself is the farmer, he himself is the Lord of the harvest, he himself is the master of the prophets. For if he sent them to gather the harvest, it is clear that they do not harvest what belongs to someone else. Instead, they harvest the things that he sowed through the prophets. In calling their ministry a harvest, he was encouraging them but also empowering them to this ministry. The Gospel of Matthew, Homily