Sayyiduna Jabir (may Allah be pleased with him) narrates: It was asked from the Prophet (peace and blessings be upon him) about making up missed fasts of Ramadan separately, so he said: "What do you think, if a person owes a debt and he pays a dirham or two dirhams at a time, until in this way he pays it all off, will the debt be considered paid or will he be considered as someone who is just giving a bill?" The people said: Yes, O Messenger of Allah! This narration is transmitted from Abu Zubair from Sayyiduna Jabir (may Allah be pleased with him).
Hadith Referenceسنن الدارقطني / كتاب الصيام / 2334
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 2334»