Mukhtasar Muslim

`Sayyiduna Umar bin Khattab (may Allah be pleased with him) says that` the Messenger of Allah (peace and blessings be upon him) said that Allah Almighty forbids you from swearing by your forefathers. Sayyiduna Umar (may Allah be pleased with him) said: By Allah! Since I heard this from the Messenger of Allah (peace and blessings be upon him), I have not sworn by (my forefathers), neither on my own behalf nor while quoting someone else.