What is the ruling on digging a specific grave in a public cemetery?

Question : Confirming graves for the deceased before their death, what is the ruling?

Answer : That is, digging the grave before its owner dies. It is not permissible. If it is in a public cemetery, it is not permissible. However, if the land is the person's property, it is his property; if he wishes, he digs in it, and if he wishes, he does not. But if it is a public cemetery, the first person to arrive is given priority, then the next.