If you see a man making du'a' (supplication) at the grave of the Prophet (peace and blessings be upon him), facing the grave, what should you say to him?

Question:
He says: Honorable Shaykh, may Allah grant you success, if I see a man making du'a' (supplication) at the grave of the Prophet (peace and blessings be upon him) while facing the grave, what should I say to him?

Answer:
Explain it to him. Say that it is not permissible to make du'a' (supplication) at the grave. If he is supplicating to the grave, that is major shirk (associating partners with Allah). But if he is supplicating to Allah at the grave, that is bid'ah (religious innovation) and a means to shirk. Graves are not places for supplication, nor for prayer, nor for i'tikaf (spiritual retreat in the mosque). No acts of worship are performed at them, except for greeting the deceased and making du'a' (supplication) for the deceased. You do not supplicate for yourself; rather, you supplicate for the deceased. Yes.