This section summarizes the previous incidents that deal primarily with healing and prepares for Jesus' charge to His disciples. It is transitional providing a bridge from the condition of the people that chapter 9 revealed to what the King determined to do about that condition (cf. 4:23-25). Jesus' work was so extensive that He needed many more workers to assist Him.
9:35 This verse summarizes the heart of Jesus' ministry in Galilee. It also provides the rationale for the new phase of His ministry through the Twelve.
9:36 Jesus' compassion for the multitudes recalls Ezekiel's description of God's compassion for Israel (Ezek. 34). "Distressed"(NASB) really means "harassed"(NIV). It pictures the Jews bullied and oppressed by their religious leaders. They were "downcast"NASB) because they were "helpless"(NIV). No one was able to deliver them. They lacked effective leadership, as sheep without a shepherd (cf. Num. 27:17; 1 Kings 22:17; 2 Chron. 18:16; Isa. 53:6; Ezek. 34:23-24; 37:24). The Old Testament describes both God and Messiah as shepherds of their people (cf. 2:6; 10:6, 16; 15:24; 25:31-46; 26:31).
9:37-38 Jesus' figure of speech in addressing His disciples, however, was an agricultural one. He wanted to infuse His compassion for the multitudes into them. Jesus viewed Israel as a field composed of many individuals. They needed gathering for placement in the barns of the kingdom. They would die where they were and the nation would suffer ruin if workers did not bring them in soon. Unfortunately there were not enough workers to do this massive task. Consequently Jesus commanded His disciples to beseech God, the lord of the harvest, to provide additional laborers for His harvest.
The picture is of imminent change. A change was coming whether or not the Israelites accepted their Messiah. It would either be beneficial or detrimental to the nation. An adequate number of workers was one factor that would determine the way the change would go. Evidently Matthew expected his readers to understand "disciples"as all who were in a learning relationship to Jesus then rather than just the Twelve. That is the way he used the term so far in this Gospel (cf. 10:1).