Charles Ellicott Commentary John 4:36

"He that reapeth receiveth wages, and gathereth fruit unto life eternal; that he that soweth and he that reapeth may rejoice together." — John 4:36 (ASV)

And he that reapeth.—The wages of the reaper is the joy—the greatest that the heart can know—of gathering others, as people gather grain into the barn, into eternal life. The sower is Christ Himself, whose words have been the seed in the woman’s heart, already bringing forth a harvest in those who are coming to Him. The reapers are the disciples. In this harvest day they would learn, from sympathy with the souls of others, the joy of the reaper, and in that joy it was ordained that sower and reaper should rejoice together.