Acts 21:20

20 When they heard it, they praised God. Then they said to him, "You see, brother, how many thousands of believers there are among the Jews, and they are all zealous for the law.

Acts 21:20 In-Context

18 The next day Paul went with us to visit James; and all the elders were present.
19 After greeting them, he related one by one the things that God had done among the Gentiles through his ministry.
20 When they heard it, they praised God. Then they said to him, "You see, brother, how many thousands of believers there are among the Jews, and they are all zealous for the law.
21 They have been told about you that you teach all the Jews living among the Gentiles to forsake Moses, and that you tell them not to circumcise their children or observe the customs.
22 What then is to be done? They will certainly hear that you have come.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.