1 Timothy 5:12
Having damnation, because they have cast off their first faith.
Cross-reference
Galatians 1:6
Parallel
In Galatians 1:6, Paul marvels at believers deserting the gospel – directly paralleling the abandonment of former faith here.
Revelation 2:4
Parallel
In Revelation 2:4, the church at Ephesus abandoned its first love – mirroring the abandonment of faith by younger widows.
Revelation 2:5
Parallel
In Revelation 2:5, the call to repent from falling away parallels the warning here, showing the path back from abandonment.