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A study of its contents clearly shows that the period of its revelation is about the same as that of Surah 6: al-An’am (The Grazing Livestock), i.e. the last year of the Prophet's life at Makkah, but it cannot be asserted with certainty which of these two were sent down earlier. The manner of its admonition clearly indicates that it belongs to the same period. [Ref: Mawdudi]
It is considered the longest surah revealed during the Makkan period. Some consider this surah to have been revealed after Surah 38: Sad. [Ref: Tafsir al-Maudheei, Dr. Mustafah Muslim, vol. 3, p. 2]