Reading from the author's text with commentary and collation of manuscripts: "It is recommended to greet the deceased when visiting him and to make du'a for him

The Shaykh : One should not be a neighbor to the deceased in a way that harms them with foul words or actions. This means that the graveyard should not be, or one should not bring anything to the graveyard that Allah has forbidden, such as musical instruments, singing, or the like, because this is a form of disrespect. The jurists (may Allah have mercy on them) mentioned that the deceased is harmed by the doing of evil near him. Yes.
The reader: "It is recommended to greet the deceased when visiting him and to make du'a for him, and the better the deceased is, the more urgent his right is. Buraydah ibn al-Husayb (may Allah be pleased with him) said:

The Messenger of Allah (peace and blessings be upon him) taught them that when they went out to the graveyards, one of them should say: Peace be upon the people of these dwellings, and in another wording: "

كان رسول الله صلى الله عليه وسلم يعلمهم إذا خرجوا إلى المقابر، أن يقول قائلهم : السلام على أهل الديار، وفي لفظ : "

Peace be upon you, people of these dwellings, from among the believers and Muslims, and we, if Allah wills, are to follow you. We ask Allah for well-being for us and for you . Muslim narrated it.

The Shaykh : He called the graves "dwellings," and this is literally true; they are the dwellings of the dead. For this reason, it is disliked to walk in them wearing sandals except out of necessity, and it is forbidden to defecate or urinate between them. Likewise, evil deeds are not to be done at the graves, because they are the dwellings of the dead.
There is a difficulty in his saying: , which is how can the will be attached to something whose occurrence is certain?
The answer is to say: meaning: if we join you, we only join you by the will of Allah. It was said that means upon Islam, but this is far-fetched. The correct meaning is that we will join you, but if Allah (Mighty and Majestic) wills. It is like His saying, the Exalted: .