It is a record of 3 witnesses Oliver Cowdery ,David Whitmer ,Martin Harris. They witnessed Joseph Smith finding the plates that God had added words on that eventually became the Book of Mormon. They plates were translated from God and the work is true, according to them. The witnesses are just verifying the story. They saw the plates and the engraving and believe they are meant to witness and share the story. They are supposed to obey these commandments of God. They mention the Holy Trinity, which is what Catholics believe. I found that very interesting.
In my Faith, the Holy Trinity is first alluded to in the book of Genesis 1:26:
Then God said, “Let us make man in our image, after our likeness; and let them have dominion over the fish of the sea, and over the birds of the air, and over the cattle, and over all the earth, and over every creeping thing that creeps upon the earth.”
And alluded to again in John 14:17 says:
even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him; you know him, for he dwells with you, and will be in you.l
The witnesses all confirmed it to be truth on their deathbeds according to Wiki. So in their lifetime they believed they witnessed this event. I’m still a little skeptical at this point. I need to keep reading.
Wiki – https://en.wikipedia.org/wiki/Three_Witnesses
The 3 Witnesses Text reads:
Be it known unto all nations, kindreds, tongues, and people, unto whom this work shall come: That we, through the grace of God the Father, and our Lord Jesus Christ, have seen the plates which contain this record, which is a record of the people of Nephi, and also of the Lamanites, his brethren, and also of the people of Jared, who came from the tower of which hath been spoken. And we also know that they have been translated by the gift and power of God, for his voice hath declared it unto us; wherefore we know of a surety that the work is true. And we also testify that we have seeen [sic] the engravings which are upon the plates; and they have been shewn unto us by the power of God, and not of man. And we declare with words of soberness, that an angel of God came down from heaven, and he brought and laid before our eyes, that we beheld and saw the plates, and the engravings thereon; and we know that it is by the grace of God the Father, and our Lord Jesus Christ, that we beheld and bear record that these things are true. And it is marvellous [sic] in our eyes. Nevertheless, the voice of the Lord commanded us that we should bear record of it; wherefore, to be obedient unto the commandments of God, we bear testimony of these things. And we know that if we are faithful in Christ, we shall rid our garments of the blood of all men, and be found spotless before the judgment-seat of Christ, and shall dwell with him eternally in the heavens. And the honor be to the Father, and to the Son, and to the Holy Ghost, which is one God. Amen.