(6) باب الْحَلِفِ بِالأُمَّهَاتِ
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'Do not swear by your fathers, nor by your mothers nor by the idols. Swear only by Allah, and do not swear unless you are sincere.'" (ID)
Reference (ID): Sunan an-Nasa'i 3769 (ID)
In-book reference (ID): Book 35, Hadith 9 (ID)
English translation (ID): Vol. 4, Book 35, Hadith 3800 (ID)