Arabic : Book 11, Hadith 2184
Ibn Majah: Hadith 2110
11. The Chapters on Expiation
سنن ابن ماجه
2110
Ibn Majahحَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ الزُّهْرِيُّ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رِوَايَةً قَالَ مَنْ حَلَفَ وَاسْتَثْنَى فَلَمْ يَحْنَثْ "
It was narrated from Ibn 'Umar:
"Whoever swears an oath and says In sha' Allah, will never break his oath."
Reference: English : Vol. 3, Book 11, Hadith 2106
Arabic : Book 11, Hadith 2184
Arabic : Book 11, Hadith 2184