#4 Two days

a person kneeling down on a red carpet
a person kneeling down on a red carpet
blue book beside brown wooden stick
blue book beside brown wooden stick

Book of Fasting

(62) Chapter: Fasting the last days of the month

Hadith 1983

Narrated Mutarrif from `Imran Ibn Husain:

That the Prophet (صلى الله عليه و سلم) asked him (Imran) or asked a man and `Imran was listening, "O Abu so-and-so! Have you fasted the last days of this month?" (The narrator thought that he said, "the month of Ramadan"). The man replied, "No, O Allah's Messenger (صلى الله عليه و سلم)!" The Prophet (صلى الله عليه و سلم) said to him, "When you finish your fasting (of Ramadan) fast two days (in Shawwal)." Through another series of narrators `Imran said, "The Prophet (صلى الله عليه و سلم) said, '(Have you fasted) the last days of Sha'ban?"