الكافي 2/2/30/5

5. Ali ibn Muhammad has narrated from Muhammad ibn Sulayman from Isma’Il ibn Ibrahim from Ja’far ibn Muhammad al-Tamimi from Husayn ibn ‘Ulwan from Abu ‘Abdillah عليه السلام who has said the following: “The Messenger of Allah has said, ‘Any believing person who prays for the believing people male and female, Allah, the Most Majestic, the Most Holy, returns to such person a reward equal to the reward for a likewise prayer with which all believing people, male and female have been praying from the beginning of time and all who will do so in future up to the Day of Judgment. A servant will be ordered and dragged to the fire and the believing people male and female will say, ‘O Lord, this is the one who prayed for us, accept our intercession for him and Allah, the Most Majestic, the Most Holy, will accept their intercession about him and he will be saved.’”