The Ruling on Praying the Funeral Prayer over the Grave

Question:
The brother Ahmad asks and says: We ask you to clarify for us the reasons that prevent praying over the grave. May Allah reward you with good.

Answer:
The Sunnah for one who did not pray over the deceased in the prayer area or in the mosque is to pray over him at the grave if that is possible for him. It is authentically reported from the Prophet (peace and blessings be upon him) that he prayed over a grave. As for...
...it was reported that a woman was standing up from the mosque when she died at night, and they prayed over her at night. He said, "Show me her grave," so they showed him, and he went out and prayed over her (peace and blessings be upon him) after the burial. So there is no barrier to praying over the deceased after burial in the cemetery. A group of scholars held that this is allowed up to one month; if a month or approximately a month has passed, they leave it, because most of what is reported from the Prophet (peace and blessings be upon him) is that he
And this is the most cautious and preferable course; because if that were left open permanently, the graves would be a place of prayer permanently. So they were cautious that the matter ends upon reaching the month and what is close to it. Yes. May Allah reward you with good.