Sahih Muslim Book 015, Hadith Number 4040.

Chapter : It is forbidden to take the oaths in the name of anyone else besides Allah.

Ibn 'Umar heard Allah's Messenger (may peace be upon him) as saying: He who has to take an oath, he must not take oath but by Allah. The Quraish used to take oath by their fathers. So he (the Holy Prophet) said: Do not take oath by your fathers.

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