Hadith.1362 - Abu al-Hasan al-Awwal (as) said regarding the words of Allah (swt), the Mighty and Majestic:
"But as for monasticism, they innovated it; We did not prescribe it for them except [that they did so] seeking the pleasure of Allah (swt)" (Surah Al-Hadid 57:27).
Imam (as) said: "It refers to the night prayer (salat al-layl)."