It is narrated from Sayyiduna Umar (may Allah be pleased with him) that I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: Allah forbids you from swearing oaths by the names of your forefathers. Sayyiduna Umar (may Allah be pleased with him) says: Since I heard the prohibition of this from the tongue of the Prophet (peace and blessings of Allah be upon him), I have never sworn such an oath, nor have I mentioned it in conversation or quoted it from anyone.