حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا عِيسَى بْنُ يُونُسَ، حَدَّثَنَا الأَجْلَحُ الْكِنْدِيُّ، عَنْ يَزِيدَ بْنِ الأَصَمِّ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِذَا حَلَفَ أَحَدُكُمْ فَلاَ يَقُلْ مَا شَاءَ اللَّهُ وَشِئْتَ . وَلَكِنْ لِيَقُلْ مَا شَاءَ اللَّهُ ثُمَّ شِئْتَ " .
It was narrated from Ibn 'Abbas that the Messenger of Allah (PBUH) said: 'When anyone of you swears an oath, let him not say: 'What Allah wills and what you will.' Rather let him say: 'What Allah wills and then what you will.' Translation Not Available
Book Ref: Sunan Ibn Majah Book 11 Hadith 2117
Web Ref: Sunan Ibn Majah Vol 3 Book 11 Hadith 2117