وَ رَوَى اَلْحَسَنُ بْنُ عَلِيٍّ اَلْوَشَّاءُ عَنْ أَبِي اَلْحَسَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ قَالَ: «إِنَّ لِكُلِّ إِمَامٍ عَهْداً فِي عُنُقِ أَوْلِيَائِهِ وَ شِيعَتِهِ وَ إِنَّ مِنْ تَمَامِ اَلْوَفَاءِ بِالْعَهْدِ زِيَارَةَ قُبُورِهِمْ فَمَنْ زَارَهُمْ رَغْبَةً فِي زِيَارَتِهِمْ وَ تَصْدِيقاً بِمَا رَغِبُوا فِيهِ كَانَ أَئِمَّتُهُمْ شُفَعَاءَهُمْ يَوْمَ اَلْقِيَامَةِ ».
Al-Hasan ibn Ali al-Washsha' narrated from Imam Ali ibn Musa Ar-Ridha (a.s) who said: "Indeed, every Imam has a covenant upon the necks of their followers and Shia, and part of fulfilling this covenant completely is visiting their graves. Whoever visits them out of a desire for their visitation and in affirmation of what they have invited towards, their Imams will be their intercessors on the Day of Judgment."