(43) باب الاِسْتِثْنَاءِ .
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'Whoever swears an oath and says: "If Allah wills, then he has made an exception."'" (ID)
Reference (ID): Sunan an-Nasa'i 3855 (ID)
In-book reference (ID): Book 35, Hadith 95 (ID)
English translation (ID): Vol. 4, Book 35, Hadith 3886 (ID)