Reserving a Special Place in the Masjid
Question :
When some older people come to the Masjid and find someone seated in their regular spot, they become angry; what is the ruling regarding this issue?
Answer:
This is not permissible; a specific place in the Masjid is the right of the person who came first, and the other person has no right to become angry.
Source:
Ibn Baz
Fatawa Islamiyah, Vol. 8 Pages 382-383