Luke 10 tells the story of Jesus sending out the seventy-two (72) men ahead of Him to preach the gospel to the towns where He would soon be going. He knew that in some of these towns the men would be met with resistance and trouble. He referred to them as lambs being sent out among wolves. The transliterated word for wolves is lykos, and was a metaphor for the cruel, greedy, rapacious, destructive men they would face.
Lambs are just the opposite of wolves. They are kind, peaceful, patient and loving. When you're a lamb, you're easy prey. I love that He sent them in pairs.