What does the Bible say about false teachers in the church?

The Scriptures highlight the presence of false teachers as a reality within the church. In Matthew 13, Jesus describes the kingdom of heaven as a field where both wheat and tares grow together until the harvest. This parable illustrates how false teachers, or tares, are allowed to exist alongside true believers until the end times, when God will separate them. 1 Corinthians 11:19 reinforces this, stating that heresies must come so that those who are approved may be made manifest. This teaches that the existence of false teachers serves to reveal the true character and faith of God's people, who are guided by the Holy Spirit to discern truth from error.