Musnad Ahmad 2:197

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from 'Urwah, from al-Miswar ibn Makhramah and 'Abd al-Rahman ibn 'Abd al-Qari, that they both heard 'Umar saying: "I passed by Hisham ibn Hakim ibn Hizam while he was reciting Surat al-Furqan..." and he mentioned its meaning.