Why do you think it would be a mistake?

If you are unsure of whether or not to get tattooed, then yes.. getting tattooed is a terrible mistake.

It can be a very painful place to get one done especially for your first one. Its a slow process as the artist has to work with your breathing.

I got my first on my ribs, and it’s fairly big. It hurt but I was able to get through it.

If you want it, it’s not a mistake.
But I feel like a text only Biblical verse might be a waste of such prime real estate though

If it’s your first tat then you will have nothing to compare it to. It won’t hurt any more or less than any of your other tats because you have none. I think it’s a great place to start. I agree with Gnarly, I hope that you have thought out what you want because a lot of people move away from religion as they age because it no longer makes sense, but that’s a whole different conversation.

I say just go for it. If you get a tattoo somewhere else on your body first it doesn’t mean it’s going to prepare you any better for your ribs. Plus you will be high on adrenaline and after an hour of tattooing it all starts to feel the same. Maybe they can spray some numbing cream halfway if you just can’t take it.
I say just dive in and do yoga breaths!