Is it permissible to pray two rak'ahs at the grave of a friend if you are deeply grieved by his loss?

Question:
If you have a deceased friend whose loss is a great grief to you, do you pray two rak'ahs at his grave as an obligation or a transfer?

Answer:
Do not pray the funeral prayer at the graves, except if you pray the funeral prayer over the body before burial. If the funeral prayer is performed over the body before burial, then you may pray the funeral prayer at the grave. As for other prayers after that, it is not permissible to pray at the graves, because the Prophet (peace and blessings be upon him) said, "Do not take the graves as mosques." The meaning of taking them as mosques is to pray at them, even if no mosque is built, because whoever prays in a place has taken it as a mosque. Or, as the Prophet (peace and blessings be upon him) said, "I have been made the earth a mosque and a place of purification," meaning it is suitable for prayer in it. As for the graves, one does not pray at them, because that is one of the means to shirk (associating partners with Allah). As for the funeral prayer, it is performed in the cemetery, and the funeral prayer is performed at the grave; this is specific to it only. May Allah reward you with good, and may He do you good.