wrapped in garments (1), stand in prayer at night.” [al-Muzzammil: 1–2] And nothing has come to abrogate this obligation for him. As for His words, “as an additional prayer for you,” if voluntary worship were intended, He would not have singled him out by describing it as additional for him. Rather, what is meant by “additional” is an increase, and an increase in itself does not imply voluntary worship. Allah Most High says:
“And We granted him Isaac, and Jacob as an additional gift.” [al-Anbiyā’: 72]
That is, in addition to the son. Likewise, the additional prayer performed by the Prophet, peace and blessings be upon him, at night increases his rank and reward. This is why he was singled out in this regard: for others, the night prayer effaces (1) and expiates sins. As for the Prophet, peace and blessings be upon him, Allah has forgiven his past and future sins. Thus, his deeds increase his degrees and elevate his rank, whereas the deeds of others expiate their sins.
Mujāhid said: It was additional for the Prophet, peace and blessings be upon him, only because his past and future sins had already been forgiven. His acts of obedience (2) were therefore additional—that is, an increase in reward—whereas, for others, they expiated their sins. Ibn al-Mundhir said in his Tafsīr (Quran Commentary) (3): We were told (4) by ʿAlī, on the authority of Abū ʿUbayd (5): Hajjāj told us,