John 4:38

sent you to reap that whereon ye bestowed no labor.

The verb "sent" is past, and refers to some event before the present incident. It can only be explained by referring it to the events of the last eight months. The disciples had baptized multitudes, "more than John" (chapter 4:1); so many that John's disciples reported "all men come unto him" (chapter 3:26). The disciples of Christ who baptized all of these (chapter 4:2), were reaping the fruit of John's sowing, to. great extent, supplemented by the labors of Christ. John had sown; they were reaping.

Other men labored.

John and other holy men, but the disciples had entered in upon their labors. So, too, Christ sowed, and at Pentecost, in Judea, and in Samaria, they afterwards entered into his labors. See the reaping of what he had sowed in Samaria, at this time, in Acts 8:5-8.