It is narrated from Ibrahim (may Allah have mercy on him) that a man made the divorce of his wife conditional upon the repayment of a debt, but among the payment there turned out to be a counterfeit dirham. He (Ibrahim) said: Instruct the wife to observe the waiting period (‘iddah).
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2723