Chapter on the Prayer Times (Mawaqit)
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 13
عَنْهُ عَنْ فَضَالَةَ عَنِ اِبْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ:« إِنْ نَامَ رَجُلٌ أَوْ نَسِيَ أَنْ يُصَلِّيَ اَلْمَغْرِبَ وَ اَلْعِشَاءَ اَلْآخِرَةَ فَإِنِ اِسْتَيْقَظَ قَبْلَ اَلْفَجْرِ قَدْرَ مَا يُصَلِّيهِمَا كِلْتَيْهِمَا فَلْيُصَلِّهِمَا وَ إِنْ خَافَ أَنْ تَفُوتَهُ إِحْدَاهُمَا فَلْيَبْدَأْ بِالْعِشَاءِ وَ إِنِ اِسْتَيْقَظَ بَعْدَ اَلْفَجْرِ فَلْيُصَلِّ اَلصُّبْحَ ثُمَّ اَلْمَغْرِبَ ثُمَّ اَلْعِشَاءَ قَبْلَ طُلُوعِ اَلشَّمْسِ»
From him, from Fadalah, from Ibn Sinan:
Abu Abdillah عليه السلام, peace be upon him, said: "If a man sleeps or forgets to pray Maghrib and the night prayer (Isha), and he wakes up before Fajr with enough time to pray both of them, then he should pray them both. But if he fears that one of them will be missed, then he should begin with Isha. And if he wakes up after Fajr, then he should pray the morning prayer (Fajr) first, then Maghrib, and then Isha before the rising of the sun."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 290
- Ṣaḥīḥ al-Tahdhīb