سورة الدخان

Imam Kazim (peace be upon him): What is meant by "Ha Mim" is Muhammad (peace be upon him and his family), and in the Book that was revealed to Hud (peace be upon him) his name appears in this form, with some of its letters [mim and dal] omitted.

Imam Sajjad (peace be upon him): Jabir ibn Abdullah al-Ansari (may Allah have mercy on him) said: "... I entered the Mosque of the Prophet (peace be upon him and his family); there I found only my master Imam Sajjad (peace be upon him) standing and offering the Fajr prayer alone ... Then he raised his two hands until they were level with his face and said [addressing Allah]: '... And You who are Blessed and Exalted, at the beginning of some of the Surahs You said: الر تِلْکَ آیاتُ الْکِتابِ الْحَکِیمِ [Alif Lam Ra. These are the verses of the Wise Book] (Yunus/1), الر [Alif Lam Ra — this is a Book whose verses have been made firm and then explained in detail] (Hud/1), الر تِلْکَ آیاتُ الْکِتابِ [Alif Lam Ra. Those are the verses of the Manifest Book] (Yusuf/1) ... and الم ذلِکَ الْکِتابُ لا رَیْبَ فِیهِ [Alif Lam Mim. That is the Book in which there is no doubt] (Baqarah/2), and [likewise] in cases similar to these from the Surahs of "Tawasin" (Surahs ash-Shuara, an-Naml, and al-Qasas, which begin with Ta Sin) and "Hawamim" (Surahs Ghafir, Fussilat, ash-Shura, az-Zukhruf, ad-Dukhan, al-Jathiyah, and al-Ahqaf, which begin with Ha Mim); in all of these cases, You followed the Qur'an with an oath preceded by the name of the one whom You singled out for Your revelation and with whom You deposited the hidden secret of Your unseen ...'"