If a man is invited to a meal, is he required to ask for permission when he arrives?

Question : He says that he should ask for permission, and he says that he should ask for permission, and he says that he should ask for permission,

Answer : We have addressed this issue, and we said that it depends on custom, because the first hadith states that his invitation is his permission, meaning that his invitation serves as permission. So the matter depends on custom and common practice.