(39) باب الاِسْتِثْنَاءِ .
It was narrated that Ibn 'Umar said:
"The Messenger of Allah said: 'Whoever swears an oath and says: If Allah wills, then he has made an exception.'" (FR)
Reference (FR): Sunan an-Nasa'i 3829 (FR)
In-book reference (FR): Book 35, Hadith 69 (FR)
English translation (FR): Vol. 4, Book 35, Hadith 3860 (FR)