"Existence of the Imam" is one of the most important Islamic teachings. The necessity of the presence of an Imam is also agreed upon by Muslim sects and only a few people have opposed it. There are many rational and narrative reasons for the obligation of the Imamate. Many verses of the Qur'an also refer to the topics of Imamate. Some verses of the Qur'an under the title "The descent of the angels and the soul on the night of Qadr" indicate the necessity of the existence of an Imam. These verses prove the existence of Imam al-Mahdi.
After proving the continuation of the night of destiny and the necessity of the descent of angels and the spirit, the necessity of the existence of an Imam has been argued. The argument starts from here that the night of al-Qadr continues after the Messenger of God; Hence, the night of al-Qadr, the descent of angels and spirit will be necessary. With the descent of the angels and the spirit, the existence of the place of the angels' descent will also be necessary. According to the requirements that are necessary for the place of the descent, the place of angels' descent will be the "Imam".
Despite the clear indication of these verses on the necessity of the Imam's existence and the recommendations of Ahl al-Bayt (the infallible Imams of shiˈa) to adduce it against the opponents, independent research on this matter is very limited. Therefore, in the following article, the obligation of Imamate and the existence of an Imam, focusing on these verses, has been pursued with the "descriptive-analytical" method.