Al-Kāfi - Volume 4 > The Virtue and Excellence of Visiting abu ‘Abd Allah, al-Husayn, ‘Alayhi al-Salam
Hadith #5

5ـ مُحَمَّدُ بْنُ الْحُسَيْنِ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ مُحَمَّدِ بْنِ صَدَقَةَ عَنْ صَالِحٍ النِّيلِيِّ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ السَّلاَم) مَنْ أَتَى قَبْرَ الْحُسَيْنِ (عَلَيْهِ السَّلاَم) عَارِفاً بِحَقِّهِ كَتَبَ الله لَهُ أَجْرَ مَنْ أَعْتَقَ أَلْفَ نَسَمَةٍ وَكَمَنْ حَمَلَ عَلَى أَلْفِ فَرَسٍ مُسْرَجَةٍ مُلْجَمَةٍ فِي سَبِيلِ الله.

5. Muhammad ibn al-Husayn has narrated from Muhammad ibn Sinan from Muhammad ibn Sadaqah from Salih al-Niliy who has said the following: “Abu ‘ Abd Allah, ‘Alayhi al-Salam, has said, Tor one who visits the grave of al-Husayn, ‘Alayhi al- Salam, with proper understanding of his rights, Allah writes for him the reward for setting free of one thousand persons. It is like readying one thousand horses fully harnessed to join the battle for the cause of Allah.”’