He presented another parable to them, saying, “The kingdom of heaven may be compared to a man who sowed good seed in his field. But while men were sleeping, his enemy came and sowed tares among the wheat, and went away.” Matthew 13:24-25
The passage of Holy Scripture above comes from a collection of parables that Jesus used to describe different aspects of the kingdom of God, sometimes referred to as the kingdom of heaven. The entire collection in Matthew 13 is referred to as The Kingdom Parables.
Jesus explained the meaning of this parable to His disciples in verses 36-43 of Chapter 13. He is the man who sowed good seed in the field. The seed is His disciples. The field is the world. The tares are Satan’s slaves, i.e., the unredeemed, and the sower of the unredeemed is Satan himself.