The Prophet ﷺ said: If anyone swears an oath and makes an exception, he may fulfil it if he wishes and break it if he wishes without any accountability for breaking.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ حَلَفَ فَاسْتَثْنَى فَإِنْ شَاءَ رَجَعَ وَإِنْ شَاءَ تَرَكَ غَيْرَ حِنْثٍ  

"Whoever swears an oath and says In sha' Allah, if he wishes he may go ahead and if he wishes he may not, without having broken his oath."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ حَلَفَ وَاسْتَثْنَى إِنْ شَاءَ رَجَعَ وَإِنْ شَاءَ تَرَكَ غَيْرُ حَانِثٍ  

"Whoever swears an oath and says: 'If Allah wills', then if he wishes he may go ahead, and if he wishes he may not, without having broken his oath." (Using translation from Nasāʾī 3793)   

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ حَلَفَ فَاسْتَثْنَى فَإِنْشَاءَ مَضَى وَإِنْ شَاءَ رَجَعَ غَيْرَ حَنِثٍ  

The Prophet ﷺ said: If anyone swears an oath and makes an exception, he may fulfil it if he wishes and break it if he wishes without any accountability for breaking. (Using translation from Abū Dāʾūd 3262)   

قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ حَلَفَ فَاسْتَثْنَى فَهُوَ بِالْخِيَارِ إِنْ شَاءَ مَضَى وَإِنْ شَاءَ تَرَكَ غَيْرَ حَنِثٍ»  

"Whoever swears an oath and says: 'If Allah wills', then if he wishes he may go ahead, and if he wishes he may not, without having broken his oath." (Using translation from Nasāʾī 3793)  

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ حَلَفَ فَاسْتَثْنَى فَإِنْ شَاءَ مَضَّى وَإِنْ شَاءَ تَرَكَ غَيْرَ حَنِثٍ»  

"مَنْ حَلَفَ فَاسْتَثْنى فَإِنْ شَاءَ مَضَى وَإنْ شَاءَ تَرَكَ غير حِنْث".