سورة المزمل

Imam Sadiq (peace be upon him): What is meant by وَ أَقْوَمُ قِیلًا [and the best corrective of speech] is rising from one's bed solely for Allah and no one else.

The Imams (peace be upon them): Ali ibn Muhammad with his chain narrates from one of the Imams (peace be upon them) that concerning the words of Allah the Exalted إِنَّ ناشِئَةَ اللَّیْلِ هِیَ أَشَدُّ وَطْئاً وَ أَقْوَمُ قِیلًا [Surely the rising by night is the firmest way to tread and the best corrective of speech] he said: "Indeed the phenomenon [and prayer] of the night... whoever performs this prayer and is regular in it, Allah writes for him in return for every prayer six hundred thousand Hajj."

Imam Sajjad (peace be upon him): It is narrated that Imam Sajjad (peace be upon him) used to pray between the Maghrib prayer and the Isha prayer and would say: "Have you not heard the words of Allah the Exalted: إِنَّ ناشِئَةَ اللَّیْلِ [Surely the rising by night]? This prayer is ناشِئَةَ اللَّیْلِ [the rising by night]."

Imam Baqir and Imam Sadiq (peace be upon them): إِنَّ ناشِئَةَ اللَّیْلِ [Surely the rising by night] means being awake at the end of the night for the night prayer.