Making up the Night Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 76
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «إِنَّ اَللَّهَ تَبَارَكَ وتَعَالَى لَيُبَاهِي مَلاَئِكَتَهُ بِالْعَبْدِ يَقْضِي صَلاَةَ اَللَّيْلِ بِالنَّهَارِ فَيَقُولُ «يَا مَلاَئِكَتِي اُنْظُرُوا إِلَى عَبْدِي يَقْضِي مَا لَمْ أَفْتَرِضْهُ عَلَيْهِ أُشْهِدُكُمْ أَنِّي قَدْ غَفَرْتُ لَهُ».
The Messenger of Allah صلى الله عليه وعلى آله وسلم said: "Indeed, Allah سبحانه وتعالى, Blessed and Exalted, takes pride in His angels with the servant who makes up the missed prayers of the night during the day. He says, 'O’ My angels, look at My servant who is fulfilling what I did not obligate upon him. I make you witness that I have forgiven him.'"
- Ṣaḥīḥ al-Faqīh