بسم الله الرحمن الرحيم
It has been mentioned by the Ahl al-Bayt (as), that there is «Night of Power» every year. On this night the orders for the whole year descends. Those in charge of the affairs [Imams from Ahl al-Bayt] receive these orders. Let's see how many Imams (as) from Ahl al-Bayt (as) will receive these orders and how many Imams (as) from Ahl al-Bayt (as) there are after Imam Ali (as).
وبهذا الاسناد قال: قال رسول الله صلى الله عليه وآله لاصحابه: آمنوا بليلة القدر إنها تكون لعلي بن أبي طالب وولده الاحد عشر من بعدي
[...] by the same documentation, Messenger of Allah (saww) told his companions, “Believe in the Night of Power [Laylat al-Qadr] as that belongs to Ali ibn Abi Talib (as) and eleven [Imams] of his progeny after me.”
Source: al-Khisal by Sheikh al-Saduq, Volume 2, page 480, Hadith Number # 48
[Note]: Ahmad al-Hassan and his Anṣār claim falsely, that 24 Imams will receive these orders.
(Click on the image below - in order to enlarge ;)