Narrated `Abdullah: The Prophet said, "Whoever has to take an oath should swear by Allah or remain silent." (i.e. He should not swear by other than Allah.)
Hadith ReferenceSahih Bukhari / The Book of Witnesses / Hadith: 2679
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة