Acts 21:20

And when they heard it, they glorified the Lord. And they said to him, " You see, brother, how many myriads of Jews there are who have believed, and they are all zealous for the law;

1. There was great rejoicing as Paul talks about churches started and growing.

2. There was also some concerns.

1. Many thousands of Jews were converted. 3,000 on Pentecost (Acts 2:41); 5,000 (Acts 4:4); and multiplied greatly (Acts 6:7).

2. Now, 25 years later, there are many thousands of Jewish converts.

3. BUT - they are zealous for the law. They are wanting to bind the Law of Moses on Gentile converts. This should have been settled in Acts 15:1-41, but it is still a problem.