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.
Sahih Muslim Book 27, Hadith 6
← Previous Hadith This hadith is narrated on the authority of Ibn Umar through another chain of transmitters.

Sahih Muslim Book 27, Hadith 5 Next Hadith → He who takes an oath in the course of which he says: By Lat (and al-'Uzza), he should say: There is no god but Allah; and that if anyone says to his friend:" Come and I will gamble with you," he should pay sadaqa.

Sahih Muslim Book 27, Hadith 7