Hadith 5

Bulugh al-Maram

Book 13: Oaths and Vows
Bulugh al-Maram 1378
وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا; أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ: { } رَوَاهُ اَلْخَمْسَةُ 1‏ .‏ وَصَحَّحَهُ اِبْنُ حِبَّانَ 2‏ .‏
"مَنْ حَلِفِ عَلَى يَمِينٍ فَقَالَ: إِنْ شَاءَ اَللَّهُ, فَلَا حِنْثَ عَلَيْهِ"
Ibn 'Umar (RA):

"Allah's Messenger (ﷺ) said: "Whoever swears an oath, and then says: "If Allah Wills", he is not held accountable if he breaks it." [Ahmad and al-Arba'a reported it, and Ibn Hibban graded it Sahih (authentic)].