John Corrill briefly mentions Three Witnesses seeing an angel and the plates.

John Corrill
2nd Hand

John Corrill, A Brief History of the Church of Christ of Latter Day Saints, (St. Louis: For the Author, 1839), 11–12, The Joseph Smith Papers website, accessed February 13, 2023

John Corrill
John Corrill
Reading Public

The Book of Mormon and its origin.

This was the first production of Smith after his call to the prophetic office. As to the origin of the Book, I made very diligent inquiry, and from all I could learn, I became satisfied that Smith was the author, and I never have been able to trace it to any other source. As to its being a Revelation from God, eleven persons besides Smith bore positive testimony of its truth.5 After getting acquainted with them, I was unable to impeach their testimony, and consequently thought that it was as consistent to give credit to them as to credit the writings of the New Testament, when I had never seen the authors nor the original copy. As the Bible, (although we see it bound in one volume) was made up of many detached parts of Revelation given from time to time, as God saw proper, through the space of four thousand years, for the special benefit of those to whom it was given, I thought it was no more than reasonable that we should also receive additional Revelation for our special benefit; for this was according to his promise, to give line upon line, precept upon precept here a little and there a little.—(Isa. xxviii. 9, 10.)

. . .

In the course of the translation, these plates were shown to eleven persons, by the special command of God: three of whom had it manifested and shown to them by an Angel from Heaven, who declared the truth of the Book, and the other eight saw the plates and handled them; and all were commanded to bear testimony to the world, of the truth of what they had seen and handled, which they did, and published their testimony in the end of the Book.

Citations in Mormonr Qnas
Copyright © B. H. Roberts Foundation
The B. H. Roberts Foundation is not owned by, operated by, or affiliated with the Church of Jesus Christ of Latter-day Saints.