“In the meantime the disciples kept urging Him, “Rabbi, eat something.” But He said, “I have food to eat that you don’t know about.” The disciples said to one another, “Could someone have brought Him something to eat? ” “My food is to do the will of Him who sent Me and to finish His work,” Jesus told them.”
John 4:31-34 HCSB
http://bible.com/72/jhn.4.31-34.hcsb