Sunan an-Nasa'i 1782

Ahmad ibn Nasr informed us; he said: ‘Amr ibn Muhammad narrated to us; he said: ‘Aththam ibn ‘Ali narrated to us; he said: al-A‘mash narrated to us, from Habib ibn Abi Thabit, from Sa‘id ibn Jubayr, from Ibn ‘Abbas, who said: The Prophet (peace and blessings be upon him) used to pray the two rak‘ahs of Fajr when he heard the call to prayer, and he would make them brief. Abu ‘Abd al-Rahman said: ‘This hadith is munkar [a rejected or anomalous report].’