'Whoever swears an oath and says In sha' Allah, he will have made an exception."(2) (Using translation from Ibn Mājah 2104)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ حَلَفَ فَقَالَ إِنْ شَاءَ اللهُ فَلَهُ ثُنْيَاهُ  

"The Messenger of Allah said: 'Whoever swears an oath and says: If Allah wills, then he has made an exception.'" (Using translation from Nasāʾī 3828)  

قَالَ رَسُولُ اللهِ ﷺ مَنْ حَلَفَ فَقَالَ إِنْ شَاءَ اللهُ فَقَدِ اسْتَثْنَى  

"Whoever swears an oath and says, 'If Allah wills,' then he has the choice: If he wishes, he may go ahead, and if he wishes he may not." (Using translation from Nasāʾī 3830)  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ حَلَفَ عَلَى يَمِينٍ فَقَالَ إِنْ شَاءَ اللهُ فَهُوَ بِالْخِيَارِ إِنْ شَاءَ مَضَى وَإِنْ شَاءَ تَرَكَ