Shevuot 30: Men Swearing on a Stack of Bibles
Chapter 4! On the "oath of testimony" - the witness swears on the Bible that his testimony is correct, as rooted in a verse in Vayikra/Leviticus, as formal court proceedings. A new mishnah: This oath of testimony is only issued to men. An other points of trustworthiness. But how valid is that testimony? Also, note that this "men" is specific - to exclude women, as compared to other more generic uses. Of course, there are other circumstances where women's testimony is acceptable. Plus, the formality of witnesses standing while giving testimony.