What about the "beforelife"? It is a common concern in all humans to know about the afterlife, but what do religions say about the beforelife? Some religions say reincarnation, and I think the vast majority of the rest just takes the subject very tangentially (since practically nothing is said about this too publicly). I would include the Christianity that is commonly taught in this category, since I don't think there is a public (non-academic, at least) discussion about this.
What does the Bible say about this?
The Bible is absolutely silent about any "before life" other than Jeremiah 1:5, which says God knew us even when we were in our mother's Womb.  that doesn't speak so much about our "before life" as God's Omniscience.

The LDS Church teaches about the "Premortal existence" but that's a doctrine unique to them.