This hadith has been transmitted thus by 'Umar b. Khattab (with a slight change of words): I heard Hisham b. Hakim reciting Surah al-Furqan during the lifetime of Allah's Messenger ( صلی اللہ علیہ وسلم ). The rest is the same but with this addition: I was about to catch hold of him in prayer, but I exercised patience till he pronounced salutation.
Authentic