The Chapter on the Virtues of Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 31
وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ - «لِلْمُصَلِّي ثَلاَثُ خِصَالٍ إِذَا هُوَ قَامَ فِي صَلاَتِهِ حَفَّتْ بِهِ اَلْمَلاَئِكَةُ مِنْ قَدَمَيْهِ إِلَى أَعْنَانِ اَلسَّمَاءِ وَ يَتَنَاثَرُ اَلْبِرُّ عَلَيْهِ مِنْ أَعْنَانِ اَلسَّمَاءِ إِلَى مَفْرِقِ رَأْسِهِ وَ مَلَكٌ مُوَكَّلٌ بِهِ يُنَادِي لَوْ يَعْلَمُ اَلْمُصَلِّي مَنْ يُنَاجِي مَا اِنْفَتَلَ.
Muhammad ibn Muslim narrated from Imam Muhammad ibn Ali Al-Baqir عليه السلام that He said: "The one who prays has three qualities: When he stands for prayer, the angels encompass him from his feet up to the highest part of sky, Goodness descends upon him from the highest part of the sky to the crown of his head, And an angel assigned to him calls out, 'If the one praying knew whom he is conversing with, he would never turn away (from the prayer).'"
- Ṣaḥīḥ al-Faqīh