But He said to them, "I have food to eat of which you do not know."  

Therefore the disciples said to one another, "Has anyone brought Him anything to eat?" 

Jesus said to them, "My food is to do the will of Him who sent Me, and to finish His work.  Do you not say, 'There are still four months and then comes the harvest'? Behold, I say to you, lift up your eyes and look at the fields, for they are already white for harvest!  And he who reaps receives wages, and gathers fruit for eternal life, that both he who sows and he who reaps may rejoice together.  For in this the saying is true: 'One sows and another reaps.'  I sent you to reap that for which you have not labored; others have labored, and you have entered into their labors."

John 4:31-38   (NKJV)