Sūrah No. 22, Revealed in Madīnah, 78 verses.
There is some debate among scholars whether all the verses of this Sūrah were revealed in Madīnah. The Sūrah takes its name from the mention of the Hajj in verse 27. Al-Hajj is the only Sūrah which has two verses (18 and 77) after which it is recommended to perform sajdah.