The third woe Jesus announces upon the Pharisees was the woe of lost souls. (Matt 23:15) says “Woe unto you scribes and Pharisees, hypocrites! For ye compass sea and land to make one proselyte, and when he is made, ye make him twofold more the child of hell than yourselves.”
Jesus doesn’t criticize the Pharisees for their zeal because they would go anywhere and do what it took to convert one to their religious movement or their way of thinking. However, he had a problem with the final outcome of many of those converts. The new converts would be even more zealous about the Pharisees religion than the Pharisees themselves; thus, making them even more a casualty of hell. That’s why this “woe” is termed the woe of the lost soul. New converts would be so excited about their new life in this new religion that they would go even further with it than the Pharisees themselves. As a result they would out Pharisee the Pharisee. And that is one of the dangers with false teachings; often the teacher himself doesn’t believe in his own doctrine as much as the one being taught; hence we continue to see Jesus use the word hypocrite! Thus, Jesus concern was for the many in this religion that were on their way to hell behind believing and receiving false teachings. Thus, we who are believers in Christ Jesus today must really understand why we believe what we believe, and not allow ourselves to be spoon fed by anyone without going to the word of God for ourselves. Because at the end of the day, none of us who say we believe in Christ Jesus want to die and go to hell because we misinterpreted or misunderstood any part of the Gospel that could hinder us from making it in.
God Bless You.