Ether 4:1

And the Lord commanded the brother of Jared to go down out of the mount ^a from the presence of the Lord, and write ^b the things which he had seen; and they were forbidden to come unto the children of men until ^c after that he should be lifted up upon the cross; and for this cause did king Mosiah keep them, that they should not come unto the world until after Christ should show himself unto his people.