(39) باب الاِسْتِثْنَاءِ .
'Abdullah bin 'Umar 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 3828 (ID)
In-book reference (ID): Book 35, Hadith 68 (ID)
English translation (ID): Vol. 4, Book 35, Hadith 3859 (ID)