Is a guarantee valid if a currently due debt (Dain Hal) is guaranteed to be paid later (Mu'ajjal)?

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The guarantee is valid when a currently due debt is guaranteed to be paid at a future specified time. The payment obligation remains current upon the principal debtor (Al-Madmun 'Anhu) but becomes deferred (Mu'ajjal) upon the guarantor (Al-Damin). The creditor may only claim payment from the principal debtor until the deferred term expires. This position is held by Al-Shafi'i and Imam Ahmad, who ruled that if a person guaranteed a debt due in three years, it remains due in three years for the guarantor. The evidence for this is the narration from Ibn 'Abbas concerning a man who owed ten dinars and brought a guarantor to the Prophet, peace be upon him. The Prophet acted as the guarantor, promising payment within a month, and subsequently paid it, stating there was no benefit in the source of the money obtained by the debtor. The legal reasoning is that since a deferred contract was entered into for a debt, the term remains deferred, similar to a sale contract. Furthermore, the right only becomes deferred upon its initial establishment concerning the guarantor, as it was not previously due from him immediately.