The professor seemed pleased with what was shown him, and gave Martin a certificate that the writings were true characters.

He also offered to assist in translating the plates, but when Martin told him that an angel had given Joseph the plates, and that part of the book was sealed, he took back the certificate and tore it up, saying "I can not read a sealed book." If you wish to read something in the Bible that will remind you of this incident you may find it in Isaiah, 29th chapter, beginning at the 10th verse.
Oliver Cowdery became acquainted with Joseph's family, while he boarded with them one winter when he was teaching school.

Hearing of Joseph in Pennsylvania and the work he was there doing, Oliver prayed to the Lord for light regarding the matter.

Receiving a testimony that it was true, Oliver went to visit Joseph, and there, as we have seen, he wrote for him.
David Whitmer was a friend of Oliver's, and the latter told David many things regarding Joseph.

While he was in Pennsylvania, Oliver wrote to David telling him to come down and see them.