It has been reported from the Prophet صلى الله عليه وسلم [that he said], “Whoever visits his parent’s graves every Friday and recites [surah] Yaa Seen by them or by one of them, he will be forgiven for each aayah or each letter.”
Shaikh al-Albaani said, ‘And the hadith shows the recommendation to recite the Quraan at the graves, but there is nothing in the Sunnah which attests to that. Rather, the Sunnah proves that the legislated thing to do when visiting the graves is only to give salaam to them [i.e., the occupants] and for it to be a reminder of the Hereafter. And the practice of the Salaf as-Saalih may Allaah be pleased with them continued upon this.
For reciting the Quraan at the graves is a hated innovation as a group of the past scholars openly stated, from them Abu Hanifah, Maalik, and Ahmad in a narration as occurs in Sharhul-Ihyaa of az-Zubaidi [2/285], he said, ‘Because no Sunnah has been reported concerning it.’
Muhammad ibn al-Hasan, and Ahmad in another narration, said, ‘It is not hated, because of what is reported from Ibn Umar: that he directed in his will that at the time of his burial the opening and closing aayahs of Surah Baqarah should be recited.’
I [i.e., al-Albaani] say: The chain of narration of this report is not authentic up to Ibn Umar, and even if it were, it would only prove the [validity of the] recitation of the Quraan at the time of burial and not unrestricted [recitation], as is clear.
So it is upon you, O Muslim, to follow the Sunnah, and beware of innovations, even if the people see it as something good, for indeed, ‘… every innovation is misguidance …’ as he said صلى الله عليه وسلم.