The Complete Pilgrimage Guide · Hadith 68 (#Ḥadīth #14)
Chapter 8 | The Rewards and the Merits of Establishing Prayers in the Mosque of Kūfah and the Mosque of Sahlah
14 حَدَّثَنِي أَبُو عَبْدِ الرَّحْمَنِ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ الْحُسَيْنِ الْعَسْكَرِيُّ عَنِ الْحَسَنِ بْنِ عَلِيِّ بْنِ مَهْزِيَارَ عَنْ أَبِيهِ عَنِ الْحَسَنِ بْنِ سَعِيدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ قَالَ سَمِعْتُ الرِّضَا (ع) يَقُولُ الصَّلَاةُ فِي مَسْجِدِ الْكُوفَةِ فُرَادَى أَفْضَلُ مِنْ سَبْعِينَ صَلَاةً فِي غَيْرِهِ جَمَاعَةً
14. Abū ‘Abdil Raḥmān Muḥammad ibn Aḥmad ibn Ḥusain Al-‘Askari narrated to me from Ḥasan ibn ‘Ali ibn Mahziyār, from his father, from Ḥasan ibn Sa’īd, from Muḥammad ibn Sinān, who said: Imam Riďā said: Establishing one prayer alone in the Mosque of Kūfah has more value than establishing seventy congregational prayers in any other mosque.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).