New Defender's Study Bible Notes
3:1 Sardis. Sardis, once the capital of ancient Lydia, was a wealthy city about thirty miles southeast of Thyatira.
3:1 name that thou livest. The church at Sardis had many members who were not truly born again, possibly second or third generation “members” who were only nominal Christians, without the zeal or commitment of their forebears who had founded the church. This is typical of many so-called “main-line” denominational churches today.