Mishkat al-Masabih #1682
Funerals
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ مُحَمَّدِ بْنِ النُّعْمَانِ يُرْفَعُ الْحَدِيثَ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ زَارَ قَبْرَ أَبَوَيْهِ أَوْ أَحَدِهِمَا فِي كُلِّ جُمُعَةٍ غُفِرَ لَهُ وَكُتِبَ بَرًّا» . رَوَاهُ الْبَيْهَقِيُّ فِي شعب الْإِيمَان مُرْسلا
Muhammad b. an-Nu‘man who traced the tradition back to the Prophet reported him as saying, “If anyone visits the grave of his parents, or of one of them, every Friday he will be granted forgiveness and it will be recorded as filial piety.”
Baihaqi transmitted it in mursal form in Shu'ab al-iman.
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About Mishkat al-Masabih
This hadith is #1682 from Mishkat al-Masabih, in the Book of Funerals.