(39) باب الاِسْتِثْنَاءِ .
It was narrated from Ibn 'Umar that the Messenger of Allah said:
"Whoever swears an oath and says, 'If Allah wills,' then he has the choice: If he wishes, he may go ahead, and if he wishes he may not." (ES)
Reference (ES): Sunan an-Nasa'i 3830 (ES)
In-book reference (ES): Book 35, Hadith 70 (ES)
English translation (ES): Vol. 4, Book 35, Hadith 3861 (ES)