What is the ruling on instructing the deceased at the time of his burial?

Question : The questioner asks: Is it permissible for a person, when the deceased has died and the people have left him, to sit at his grave and say to him, "O so-and-so, son of so-and-so"—that is, to call him by his mother's name—saying, "If the two angels come to you and ask you, 'Who is your Lord?' say, 'My Lord is Allah.' 'What is your religion?' say, 'Islam.' 'Who is your Prophet?' say, 'Muhammad'?" This is the instruction (talaqqin) after death.

Answer : A hadith has been narrated regarding this from Abu Umamah al-Bahili from the Prophet (peace and blessings be upon him), from the Prophet (peace and blessings be upon him).
And what actually came from the Messenger of Allah (peace and blessings be upon him) is what Abu Dawud narrated, which is that he (peace and blessings be upon him), when a person died and the burial was completed, would stand over the grave and say, "Seek forgiveness for your brother and ask Allah for steadfastness for him, for he is now being asked." This is what should be done: a person should stand and ask Allah the Exalted for steadfastness for the one in the grave and seek forgiveness for him, saying, "O Allah, forgive him. O Allah, grant him steadfastness with the firm word." And so on. This is what came from the Prophet (peace and blessings be upon him). And it is among the religious innovations (bid'ah), because if the hadith is not authentic in any way, adopting it as a practice becomes an innovation.