Rule 624 A tenant is not permitted to deny the title of his landlord at the time of the commencement of the relation.

When you rent a place from a landlord, you are accepting that the landlord owns or has the right to rent that property to you. By agreeing to the rental, you are legally treated as having recognized the landlord's ownership rights at the time you moved in.

This means that if a dispute comes up in court, a tenant cannot turn around and argue that the landlord never had the right to rent the property in the first place. The law prevents tenants from using that argument because they already accepted the landlord's authority when they signed on as a tenant.