First: To indicate that in His Inwardness—which is the Unknown Limit—He is not described by any attribute, and none knows what He is except Himself.

Second: To indicate that the primary names, speech, and attributes used to describe the Worshiped Meaning fall upon His Name—which is His Greatest Veil—and not upon His Divine Ahadite Essence. This is because the existence of the Exalted, as witnessed by the Greatest Name through attributes according to its capacity, is the Ancient Worshiped Meaning upon whom the name Al-Ahad is placed so that you may call upon Him. Through this, we are guided to the knowledge of the Meaning intended by it without [complete] perception, just as our eyes see His existence without encompassing Him.

For He—Glory be to Him—described His Essence with the name Al-Ahad: {Say: He is Allah, [who is] One} (Al-Ikhlas 1). He also applied this name to the Day of Sunday (Yawm al-Ahad). The People of Monotheism established its personification in the two ways mentioned, all for the sake of subtle meanings.

Al-Ahad in linguistic books... The Meaning (Al-Ma'na) is uniquely eternal. The Name (Al-Ism) is one eternally.

In linguistic books, the meaning of Al-Ahad (The Unique) is a name for one who has no partner in essence. It is a noun constructed to