What does the Bible say about bad shepherds?

In John 10, Jesus refers to bad shepherds as thieves who try to take what belongs to Him. These false teachers, like the Pharisees and scribes, do not preach the message of grace, but instead promote salvation by works, which undermines the gospel. Additionally, they are depicted as robbers who inflict spiritual harm on the sheep by denying them the truth of God's Word. Ultimately, these individuals do not care for the sheep and will flee in times of danger, revealing their lack of genuine concern and commitment.