What is the ruling on visiting the Prophet's grave?

Question:
The questioner asks: Is it permissible to visit the grave of the Prophet (peace and blessings be upon him)? And if it is permissible, what should I say?

Answer:
Yes, it is recommended to visit the grave of the Messenger (peace and blessings be upon him) and the other graves for the sake of taking a lesson, drawing a warning, and offering the salam. He (peace and blessings be upon him) said: This includes the grave of the Prophet (peace and blessings be upon him) and the graves of the Companions; one visits them to offer the salam to them and to make du'a for them, and to take a lesson and draw a warning. Yes. And he says that when he visits, he says, "Peace be upon you, so-and-so." If it is the Prophet (peace and blessings be upon him), he says: and His blessings. And likewise, if one visits anyone other than the Prophet, when he visits any of the deceased, he offers the salam to him by name, saying, "Peace be upon you, so-and-so, and may Allah have mercy on you and His blessings." Then he makes du'a for him; make du'a for him with mercy and forgiveness. Yes.