What is the ruling when a landlord and a tenant disagree on the duration of a lease agreement for a fixed rent?

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When a dispute arises regarding the duration of a lease, and the landlord states, 'I rented it to you for one dinar for one year,' while the tenant claims, 'Rather, it was for two years for two dinars,' the statement of the landlord prevails. This is because the tenant is asserting an increase (in duration and potentially rent), and the statement of the denying party is accepted regarding what they deny, similar to a dispute over the subject of a sale where one asserts an addition. The ruling is based on the principle that the claimant who asserts an addition bears the burden of proof.