Luke

Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.

Say not ye, There are yet 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.

For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock.

And he called unto him the twelve, and began to send them forth by two and two; and gave them power over unclean spirits;

And he said unto me, Son of man, I send thee to the children of Israel, to a rebellious nation that hath rebelled against me: they and their fathers have transgressed against me, even unto this very day.