Any idea of what this actually refers to?
Not that it matters since I would be highly skeptical
to associate with those that take these oaths either lightly or seriously
7
“To all of which I do most solemnly and sincerely promise and swear
Any idea of what this actually refers to?”
The rest of the obligation. These - or similar language, the ceremonies do vary somewhat from place to place - are just the last line of each.
Also, it is made quite clear that the language is symbolic. Symbolic death (i.e. expulsion from membership) is the most severe penalty that can be imposed. The fuller meaning and rationale for the language becomes clear later on. It’s no more of a “blood oath” than “cross my heart and hope to die” is.