You're giving testimony in court, or maybe you're assuming public office.
In both cases, it's customary to swear on a holy object.
So, Pagan: on what do you swear?
Strike me dead if I'd swear on one of their accursed books.
Strike me dead if I'd swear on a book at all.
In the old days, there were statues of the gods in law courts for people to touch while taking their oaths. In these barbarous days, a small one would do, I suppose: provided it were handled with respect.
You can swear on the coven sword, I'm told. (An Alexandrian trope, I believe.) Good luck with the metal detectors.
Me, I'd swear by the Oldest, as our people have sworn forever.
So witness Earth (bend and touch her).
So witness Sky (raise hands).