Revelation manuscript for D&C 20.
Revelation Book 1, 53, The Joseph Smith Papers website, accessed June 4, 2021
For after that <it> truly was manifested unto this first Elder that he had Received a remission of his sins he was entangeled again in the vanities of the world but after truly Repenting God ministered unto him by an Holy Angel whose countenance was as Lightning & whose garments were pure & white above all whiteness