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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.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَنْ حَلَفَ فَقَالَ إِنْ شَاءَ اللَّهُ فَقَدِ اسْتَثْنَى ‏"‏ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 3829
• Sunan an-Nasa'i, Vol. 4, Book of Oaths and Vows & Agriculture, Hadith 3860
• Sunan an-Nasa'i, Book of Oaths and Vows & Agriculture, Hadith 3860