28-13 Ali ibn Ahmad ibn Musa - may God be pleased with him - narrated that Ali ibn al-Hassan al-Hassanjani quoted sa’id ibn Kasir ibn Afir, on the authority of Ibn Lahay’at and Rashdayn ibn Sa’ed, on the authority of Hurayz ibn Abdullah, on the authority of Aba Abdul Rahman al-Habali, on the authority of Abdullah ibn Amr,

“When God’s Prophet (MGB) was so ill that he (MGB) was about to die, he (MGB) said, ‘Call in my friend.’ They sent someone after Ali (MGB). When Ali (MGB) came in, the Prophet (MGB) and Ali (MGB) turned their faces towards the wall and pulled their cloak over their heads. The people were standing still outside the door until Ali (MGB) came out. A man asked him (MGB), ‘Did God’s Prophet (MGB) disclose any secrets to you?’ Ali (MGB) replied, ‘Yes. The Prophet (MGB) disclosed to me one-thousand gates each of which opens up to another one-thousand gates.’ The man said, ‘Did you memorize them?’ Ali (MGB) replied, ‘Yes. Moreover I understood them.’ The man asked, ‘What is the blackness that is in the moon?’ Ali (MGB) replied, ‘Indeed the Honorable the Exalted God said, ‘We have made the Night and the Day as two(of Our) Signs: the Sign of the Night have We obscured, while the Sign of the Day We have made to enlighten you; that ye may seek bounty from your Lord, and that ye may know the number and count of the years: all things have We explained in detail.’’ The man told him, ‘O Ali! You truly understood it.’”