Question: Does Nephi’s writings show an Egyptian literary style?
Answer: According to Hugh Nibley, “Egyptian literary writings regularly close with the formal iw-f-pw, ‘Thus it is,’ ‘and so it is’.”
“But the Lord knoweth all things from the beginning; wherefore, he prepareth a way to accomplish all his works among the children of men; for behold, he hath all power unto the fulfilling of all his words. And thus it is. Amen.” (1 Nephi 9:6)
“And now I make an end of speaking concerning the things which I saw while I was carried away in the spirit; and if all the things which I saw are not written, the things which I have written are true. And thus it is. Amen.” (1 Nephi 14:30)
“Wherefore, ye need not suppose that I and my father are the only ones that have testified, and also taught them. Wherefore, if ye shall be obedient to the commandments, and endure to the end, ye shall be saved at the last day. And thus it is. Amen. (1 Nephi 22:31)
Source: 400 Questions and Answers About the Book of Mormon by Susan Easton Black, p. 86.