He put before them another parable: “The kingdom of heaven may be compared to someone who sowed good seed in his field; but while everybody was asleep, an enemy came and sowed weeds among the wheat, and then went away. So when the plants came up and bore grain, then the weeds appeared as well. And the slaves of the householder came and said to him, ‘Master, did you not sow good seed in your field? Where, then, did these weeds come from?’ He answered, ‘An enemy has done this.’ The slaves said to him, ‘Then do you want us to go and gather them?’ But he replied, ‘No; for in gathering the weeds you would uproot the wheat along with them. Let both of them grow together until the harvest; and at harvest time I will tell the reapers, Collect the weeds first and bind them in bundles to be burned, but gather the wheat into my barn.’”
Matthew 13:24-30 (NRSV)