v10
Come now therefore, and I will send thee unto Pharaoh, that thou mayest bring forth my people the children of Israel out of Egypt.
In Matthew 9:38, it was Jesus' disciples whom he instructed to pray for laborers, and it was also some of the disciples whom He sent forth. When we pray for the Lord to do something about a situation, we should be prepared for Him to send us, personally, to do something about it.
Application
As I pray for the Lord to send forth laborers into the harvest, I'll continue to be prepared to go preach the gospel.