He replied:

Praise be to Allah. Yes, the original lease is valid. However, the second grant-holder may uphold it if he wishes. Indeed, the land became his from the moment it was granted to him, so he may lease it to that tenant or decline to do so. If the tenant has crops growing on it, he is to allow them to remain at the prevailing rent until they mature. If the tenant has neither tangible property nor any benefit in the land, he is entitled to nothing.

He was asked—may Allah have mercy on him:

A man held a land grant. Someone approached him and asked to lease the agricultural land, and he leased it to that person without inspecting it; he also inquired about it. The tenant had told the other man, “Unless you lease out your land, it will lie fallow.” Fearing that the land would lie fallow, the soldier leased it without inspecting it. Then someone else from the locality came and informed the soldier, “The tenant has leased your land for less than its rental value, for the partners’ land is registered at a higher rent than this.” May the soldier cancel the written lease and lease the land to someone else for a year at its proper rental value, or not?

He replied:

Praise be to Allah. If the tenant deceived the lessor—for example, by giving him information about the land that would diminish its rental value when the facts were otherwise—the lessor may cancel the lease.