Hadith
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ الزُّهْرِيُّ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رِوَايَةً قَالَ " مَنْ حَلَفَ وَاسْتَثْنَى فَلَمْ يَحْنَثْ " .
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It was narrated from Ibn 'Umar:"Whoever swears an oath and says In sha' Allah, will never break his oath
Sahih · Al-Albani
Sunan Ibn Majah 2106 ·Book 11, Hadith 17·Also available on sunnah.com·