Al-Kāfi
Hadith 18272ـ وَرُوِيَ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ يَحْيَى بْنِ عِمْرَانَ الْحَلَبِيِّ عَنْ ذَرِيحٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ تُصَلِّيهَا بِاللَّيْلِ وَتُصَلِّيهَا فِي السَّفَرِ بِاللَّيْلِ وَالنَّهَارِ وَإِنْ شِئْتَ فَاجْعَلْهَا مِنْ نَوَافِلِكَ.
2. It is narrated from Ibn Abi ‘Umayr from Yahya ibn ‘Imran al-Halabiy from Dharih who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘You can perform this Salah (prayer) during the night and on a journey, during the night or day, and if you like, you can make it part of your optional Salah (prayer).”’