It is narrated from Abu al-Ala' (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) said to a man: "Did you fast the last days of this month?" He said: "No." He (peace and blessings be upon him) said: "When you stop fasting, fast two days in its place." (Sulayman al-Taymi (may Allah have mercy on him) said:) I asked a man from the family of Abu al-Ala' from whom Abu al-Ala' narrates this. He said: From Imran bin Husayn (may Allah be pleased with him), from the Prophet (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15316