http://www.fivedoves.com/letters/sep2022/stevec94-2.htm

Dear Steve & Fellow Watchers,

The verses you quoted are from letters in the Book of Revelation written through John the Apostle to two Jewish Assemblies: Sardis & Philadelphia.

Sardis: Chapter 2, Verse 9
Philadelphia: Chapter 3, Verse 9

Using them as proof texts could be inappropriate. The two studies linked below make much more sense to me. This could be due to my understanding of all things biblical from a mid-act's dispensational perspective. Indeed, the Revelation letters to the 7 Jewish Assemblies could very well become activated after the Mystery Church has been raptured!

https://www.bibleref.com/Revelation/2/Revelation-2-9.html

https://www.bibleref.com/Revelation/3/Revelation-chapter-3.html

All the Best,
Mike P.