24 Another story he set before them went like this: “The kingdom from the sky may be compared to a man who planted good seed in his field,
25 but while his men were sleeping, his opponent came and sowed poisonous weeds among the wheat and went away.
26 So when the plants came up and produced grain, then the poisonous weeds appeared also.
27 And the workers of the master of the house came and asked him, ‘Master, did you not plant proper seed in your field? Then why does it have poisonous weeds?’
28 He said to them, ‘An opponent has done this.’ So the workers said to him, ‘Do you want us to go and gather them now?’
29 But he said, ‘No, when you gather the poisonous weeds you might root up the wheat along with them.
30 Let both grow together until the harvest, and at harvest time I will tell the harvesters, Gather the poisonous weeds first and tie them in bundles to destroy by burning, but gather the wheat into my barn.'”
when bad seed crops up
This story focuses on the fact that the world contains many who appear to be citizens of the coming kingdom but are not. It has an eschatological element (because of the future harvest it depicts). But Jesus told the story to his disciples because they would lead a church which would sometimes find it difficult to distinguish itself from the world around it. The field is not the church, but the world. It would contain a great number of “good” “decent” sinners, who would reject the gospel. They would look a lot like the wheat that the Master planted, but would be inwardly poisonous. His instruction to his disciples was for them not to try and rid the world of those “good” “decent” sinners. The future harvest will show them for what they really are.
LORD, help us to focus on spreading the message of the gospel, and not to worry about trying to get rid of those who reject it. You have that covered.
 zizánion: “a particularly undesirable weed resembling wheat and possessing a seed which is poisonous” (Louw-Nida Lexicon).
 katakaío: “to destroy something by burning” (Louw-Nida Lexicon); “destroy by fire, consume by fire” (Friberg Lexicon).