Alma 34:8

And now behold, I will testify unto you of myself, that these things are true.—Behold, I say unto you, that I do know that Christ shall come among the children of men, to take upon him the transgressions of his people, and that he shall atone for the sins of the world; for the Lord God hath spoken it;

I will tell you myself that these things are true. I know that Christ will come to the people. He will take the wrongs of his people on himself. He will pay for the sins of the world. The Lord God has said this.

Now I’ll add my own testimony: these things are true. I know that Christ will come among humanity to take on the sins of his people. He will atone for the sins of the world. The Lord God has spoken it.