Those who are the people of the Qur'an are those who preserve it by acting in accordance with it. They memorize the verses (āyāt) of the Qur'an and, by acting upon it, they offer bayān (clear exposition) of it. Abū Yazīd al-Bisṭāmī was one of them. Abū Mūsā Dili stated that he did not die before offering bayān of the Qur'an. His character was the Qur'an; he was among its people.
Among the people of virtue, the people of the Qur'an are also among the people of Allah, for the Qur'an is the speech (kalām) of Allah. His kalām (speech) is His knowledge, and His knowledge is His Essence (Dhāt). Sahl ʿAbd Allāh al-Tustarī attained this station (maqām) at the age of six. For this reason, his beginning on this path was the prostration of the heart (sujūd al-qalb). Many of Allah's exalted and long-lived walī (friends of God) have died without attaining the state (ḥāl) of the prostration of the heart that he reached, even though they realized the station of walāya (friendship with God) and remained steadfast (sābit-qadam) in that station, yet never knowing that the heart could prostrate. When the heart comes to be in a state of prostration, it never lifts its head from prostration. The prostration of the heart is its steadfastness (thabāt) upon that single step, which is above them and is the source of many steps. (Futūḥāt, II, 22-23)
Sujūd al-qalb (the prostration of the heart) is, while acting with one's limbs, to be annihilated (fanāʾ) in Him alone during the witnessing (mushāhada) of the Real (al-Ḥaqq), such that one is not occupied with anything other than Him and does not turn one's gaze away from Him. (Kāshānī, 100; Jāmiʿ, 85)