Acts 8:9

8:9 Now in that city was a man named Simon, who had been practicing magic ¹  and amazing the people of Samaria, claiming to be someone great.

Acts 8:11

8:11 And they paid close attention to him because he had amazed them for a long time with his magic.

[8:9]  ¹ tn On the idiom προϋπῆρχεν μαγεύων (prouphrcen mageuwn) meaning “had been practicing magic” see BDAG 889 s.v. προϋπάρχω.