Surah al-Mu'minun (The Believers ) 23 : 99

Both its style and theme indicate that it was revealed during the middle stage of Prophethood at Makkah. Reading between the lines one feels that a bitter conflict had begun between the Prophet and the disbelievers of Makkah though the persecution by them had not yet become tyrannical. It appears that the Surah was sent down during the climax of the “Famine” in Makkah (v. 75-76) which according to authentic traditions occurred during the middle stage of Prophethood. Moreover, according to a tradition related by ‘Urwah bin Zubair, Hadarat Umar who had embraced Islam by that time said, ‘This Surah was revealed in my presence and I myself observed the state of the Holy Prophet during its revelation. When the revelation ended the Holy Prophet remarked ‘On this occasion ten such verses have been sent down to me that the one who measures up to them will most surely go to Paradise’. Then he recited the initial verses of the Surah. (Ahmad and Tirmidhi)