I have written a great deal on the biblical and patristic evidence for baptismal regeneration, such as:
The Book of Mormon is a great witness to the truth of this doctrine. In the following, we read of how, at baptism, one is infused with God’s grace (and therefore, serving, not just as a witness of baptismal regeneration, but also of the transformative [not merely declarative] nature of justification):
And after this manner he did baptize every one that went forth to the place of Mormon; and they were in number about two hundred and four souls; yea, and they were baptized in the waters of Mormon, and were filled with the grace of God. (Mosiah 18:16)
