Matthew 23: 15 (ESV)
Seven Woes to the Scribes and Pharisees (2nd Woe)
15 Woe to you, scribes and Pharisees, hypocrites! For you travel across sea and land to make a single proselyte, and when he becomes a proselyte, you make him twice as much a child of hell
The scribes and Pharisees did embark on mission and evangelism trips, but the preaching fell short, because they did not believe in Jesus.
The content would have been deficient and based on your own merits instead of Christ.
I pray: O Lord, I believe and confess that Jesus Christ is
my Lord. Amen.