Sahih Muslim
Hadith #1900
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 (ﷺ)."" 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