The Chapter on the Virtues of Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 31
وَقَالَ عَلَيْهِ اَلسَّلاَمُ كَانَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ يَقُولُ: «مَنْ حَبَسَ نَفْسَهُ عَلَى صَلاَةٍ فَرِيضَةٍ يَنْتَظِرُ وَقْتَهَا فَصَلاَّهَا فِي أَوَّلِ وَقْتِهَا فَأَتَمَّ رُكُوعَهَا وَ سُجُودَهَا وَ خُشُوعَهَا ثُمَّ مَجَّدَ اَللَّهَ عَزَّ وَ جَلَّ وَ عَظَّمَهُ وَ حَمَّدَهُ حَتَّى يَدْخُلَ وَقْتُ صَلاَةٍ أُخْرَى لَمْ يَلْغُ بَيْنَهُمَا كَتَبَ اَللَّهُ لَهُ كَأَجْرِ اَلْحَاجِّ وَ اَلْمُعْتَمِرِ وَ كَانَ مِنْ أَهْلِ عِلِّيِّينَ.
Imam عليه السلام said: "The Messenger of Allah صلى الله عليه وعلى آله وسلم used to say: "Whoever devotes himself to a prescribed prayer, waiting for its time, then prays it at its first appointed time, completes its bowing (ruku'), prostration (Sujood), and attentiveness (khushu'), and then glorifies, magnifies, and praises Allah سبحانه وتعالى, the Mighty and Majestic, until the time for the next prayer arrives without engaging in idle talk in between, Allah سبحانه وتعالى will record for him the reward of a pilgrim (Hajj) and one who performs 'Umrah, and he will be among the people of 'Illiyyīn (the highest ranks in Paradise)."
- Ṣaḥīḥ al-Faqīh