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What was the first divine witness that Oliver Cowdery received to know the work of Joseph Smith was from God?
The Lord spoke peace to Oliver Cowdery’s mind.
“Verily, verily, I say unto you, if you desire a further witness, cast your mind upon the night that you cried unto me in your heart, that you might know concerning the truth of these things.
“Did I not speak peace to your mind concerning the matter? What greater witness can you have than from God” (D&C 6:22–23).
The Prophet Joseph Smith reported that “after we had received this revelation [in Doctrine and Covenants 6], Oliver Cowdery stated to me that after he had gone to my father’s to board, and after the family had communicated to him concerning my having obtained the plates, that one night after he had retired to bed he called upon the Lord to know if these things were so, and the Lord manifested to him that they were true, but he had kept the circumstance entirely secret, and had mentioned it to no one; so that after this revelation was given, he knew that the work was true, because no being living knew of the thing alluded to in the revelation, but God and himself” (History of the Church, 1:35).