Hadith 1780
It is narrated from Sayyiduna Imran bin Husain (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to a man: "Did you fast at the end of this month?" He replied: No. The Prophet said: "When you have completed the fasts of Ramadan, then keep two fasts at the end of the month." Imam Darimi (may Allah have mercy on him) said: By «سرره» is meant the end of the month.