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The Surah takes its name from the sentence Idha jaa kal-munafiquna of verse 1. This is the name of the Surah as well as the title of its subject matter, for in it a review has been made of the conduct and attitude of the hypocrites themselves.
Period of Revelation
As we shall explain below this Surah was sent down either during the Holy Prophet's return journey from his campaign against Bani al- Mustaliq, or immediately after his arrival back at Madinah, and we have established by argument and research in the Introduction to Surah An-Nur that the campaign against Bani al-Mustaliq had taken place in Sha'ban A. H. 6:Thus, the date of the revelation of this Surah is determined precisely.