The Baghdadi Hanbali scholar Abu al Khattab al-Kalwadhani (432-510h) in his book الهداية على مذهب الإمام أحمد states:
Abu al Khattab al-Kalwadhani says it is a sunnah to prompt the dead (talqeen) after burial and quotes the narration of Abu Umamah that the Prophet صلى الله عليه وسلم said: “When one of you dies and you have put the dust upon (the grave), let one of you stand at the head of the grave and say, “O So and so Son of So and so” for he will hear, though he cannot reply – then let him say, “O So and so Son of So and so” a second time and he will sit down, then let him say, “O So and so Son of So and so”and then he will say, “Direct me, Allah have mercy upon you mercy on you,” though you will not hear it, and you should say, “Remember the creed upon which you departed from this world, the testification that there is no god but Allah, and Muhammad is His slave and messenger, and that you accepted Allah as your Lord, Islam as your religion, Muhammad peace be upon him as your prophet, and the Quran as your exemplar.” For then the two angels Munkar and Nakir will say, “what is there to keep us here beside someone who has been instructed how to make his plea?”A Man said, “O Messenger of Alllah, what if one does not know the name of his mother?” and he answered, ‘Then one should mention his descent from his mother Eve”.
Abu al Khattab al-Kalwadhani later says
“It is not forbidden to read the Quran over the grave as per the correct of two reports, and any pious deed which is done and rewarded to the deceased Muslim, it will be beneficial to him.”
Wahhabism Unveiled 