The Time for Night Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 66
وَ رَوَى عَبْدُ اَللَّهِ بْنُ مُسْكَانَ عَنْ لَيْثٍ اَلْمُرَادِيِّ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلصَّلاَةِ فِي اَلصَّيْفِ فِي اَللَّيَالِي اَلْقِصَارِ صَلاَةِ اَللَّيْلِ فِي أَوَّلِ اَللَّيْلِ فَقَالَ «نَعَمْ نِعْمَ مَا رَأَيْتَ وَ نِعْمَ مَا صَنَعْتَ.
Abdullah ibn Muskan reported from Layth al-Muradi who said: "I asked Imam Jafar ibn Muhammad Al-Sadiq عليه السلام about praying the night prayer during the summer, when the nights are short, and performing it at the beginning of the night. Imam عليه السلام said: 'Yes, what you have considered is good, and what you have done is good.'"
- Ṣaḥīḥ al-Faqīh