The Eight Martyrs
This story comes from the Second Book of the Maccabees, or 2 Maccabees, one of the 73 books of the Old Testament. Martin Luther tossed this book from the Protestant Bible in the 1500’s because it references Purgatory.
As a reminder, the seven brothers from the Second Book of Maccabees are not the same as the Maccabees, the brothers who led the revolt against the Seleucid kings.