Matthew 13:30 (KJV)

He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?

But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.

Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.

Another parable put he forth unto them, saying, The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field:

Which indeed is the least of all seeds: but when it is grown, it is the greatest among herbs, and becometh a tree, so that the birds of the air come and lodge in the branches thereof.