The fact of the Blessed Trinity is present in the first 3 letters of the Bible, the first 3 words, the first 3 verses, the first 3 chapters, and up to its entire structure as "the Law, the Prophets and the Psalms [Writings]". Before Christ came, no one could see it. After Jesus Christ revealed the truth of Three Persons in One God, it is to be found everywhere.
This podcast is a sample chapter from "Crucifixion to Creation: Roots of the Traditional Mass Traced Back to Paradise".
The book is available in print, as audiobook and ebook here: https://bit.ly/Crucifixion-to-Creation