And it was narrated to me by Abu al-Tahir Ahmad ibn 'Amr ibn Sarh: Ibn Wahb narrated to us from Yunus. (Another chain:) And it was narrated to me by Harmalah ibn Yahya: Ibn Wahb informed us, Yunus informed me, from Ibn Shihab, from Salim ibn 'Abdullah, from his father, who said: I heard 'Umar ibn al-Khattab say: The Messenger of Allah, peace and blessings be upon him, said: "Verily Allah, Mighty and Majestic, forbids you from swearing by your fathers." 'Umar said: By Allah, I have not sworn by them since I heard the Messenger of Allah, peace and blessings be upon him, forbid it—neither intentionally nor in reporting the words of others.