Chapter on Virtues of Hajj
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 2
وَ قَالَ عَلَيْهِ اَلسَّلاَمُ: «إِذَا دَعَا اَلرَّجُلُ لِأَخِيهِ بِظَهْرِ اَلْغَيْبِ نُودِيَ مِنَ اَلْعَرْشِ وَ لَكَ مِائَةُ أَلْفِ ضِعْفِ مِثْلِهِ وَ إِذَا دَعَا لِنَفْسِهِ كَانَتْ لَهُ وَاحِدَةٌ فَمِائَةُ أَلْفٍ مَضْمُونَةٌ خَيْرٌ مِنْ وَاحِدَةٍ لاَ يُدْرَى يُسْتَجَابُ لَهُ أَمْ لاَ ».
Imam عليه السلام said: "When a person prays for their brother in their absence, a caller from the Throne announces, 'For you is one hundred thousand times the like of it.' But when they pray for themselves, they receive only one. Therefore, one hundred thousand guaranteed is better than one uncertain, as it is not known whether their personal supplication will be answered or not."
- Ṣaḥīḥ al-Faqīh