Matthew Davis says that Joseph emphasized that the BOM was direct revelation from heaven.
Joseph Smith, Discourse, February 5, 1840: [3], The Joseph Smith Papers website, accessed February 5, 2021
He closed by referring to the Mormon Bible, which, he said, contained nothing inconsistent or conflicting with the Christian Bible. And he again repeated, that all who would follow the precepts of the Bible whether Mormon or not, would assuredly be saved. Throughout his whole address, he displayed, strongly, a spirit of Charity and Forbearance The Mormon Bible, he said, was communicated to him, direct from Heaven. If there was such a thing on Earth, as the Author of it, then he (Smith) was the Author; but the idea that he wished to impress was, that he had penned it as dictated by God.