Acts 19:19

19 while many of those who had practiced magic collected their books and burned them in front of everyone. So they calculated their value, and found it to be 50,000 pieces of silver.

Acts 19:19 In-Context

17 This became known to everyone who lived in Ephesus, both Jews and Greeks. Then fear fell on all of them, and the name of the Lord Jesus was magnified.
18 And many who had become believers came confessing and disclosing their practices,
19 while many of those who had practiced magic collected their books and burned them in front of everyone. So they calculated their value, and found it to be 50,000 pieces of silver.
20 In this way the Lord's message flourished and prevailed.
21 When these events were over, Paul resolved in the Spirit to pass through Macedonia and Achaia and go to Jerusalem. "After I've been there," he said, "I must see Rome as well!"
Holman Christian Standard Bible ® Copyright © 2003, 2002, 2000, 1999 by Holman Bible Publishers.  Used by permission.  All rights reserved.