١٦ وَ بِإِسْنَادِهِ عَنْ مُحَمَّدِ بْنِ الْفَضْلِ عَنْ أَبِي نَابٍ عَنْ أَبِي عَبْدِ اللَّهِ (ع) قَالَ سَأَلْتُهُ عَنْ زِيَارَةِ قَبْرِ الْحُسَيْنِ (ص) قَالَ نَعَمْ تَعْدِلُ عُمْرَةً وَ لَا يَنْبَغِي التَّخَلُّفُ عَنْهُ أَكْثَرَ مِنْ أَرْبَعِ سِنِينَ
16. ‘Amraki (ibn ‘Ali) narrated through his Isnād from Muĥammad ibn Faďl, from Abǐ Nāb, who said: I asked Abā ‘Abdillāh (Imam Šādiq ) about (the reward for) going to the Ziyārah of the grave of Ĥusain . Imam  said, “Yes. It is equal to performing an ‘Umrah and one should not refrain from (going to) him for longer than four years.”