"Jesus said unto them, My meat is to do the will of him who sent me. Say not ye, there are four months, and then cometh harvest? Behold, I say unto you, lift up your eyes, and look on the fields; for they are white already to harvest. And he that reapeth receiveth wages, and gathereth fruit unto life eternal: and both he that soweth and he that reapeth rejoiceth together. And herein is that saying true, One soweth and another reapeth. I sent you to reap that whereon ye bestowed no labor. Othe men labored, and ye entered into their reward." - John 4:34-38
Recommended reading:
The Bible
Is the Bible Infallible?