Must the landlord refund the rent for the month in which the tenant did not benefit?

The lease contract is one of the binding contracts that neither party may unilaterally terminate. As soon as the contract is concluded, the lessor owns the rent, and the lessee owns the usufruct. If the contract is validly concluded, the property owner has the right to keep the rent even if the leased property is not used, and he is not obligated to return it. It is recommended for the lessor to release the lessee if he requests it, based on the hadith: "Whoever relieves a Muslim [from his contract], Allah will relieve him of his stumbles." However, if he does not do so, there is no sin upon him.