Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)
22/13. Chapter:
Is Al-Qasam An Oath ?
Sunan Abi Dawud
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ فَارِسٍ، أَخْبَرَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا سُلَيْمَانُ بْنُ كَثِيرٍ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ، عَنِ ابْنِ عَبَّاسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم بِهَذَا الْحَدِيثِ لَمْ يَذْكُرِ الْقَسَمَ، زَادَ فِيهِ وَلَمْ يُخْبِرْهُ .
The tradition mentioned above has also been transmitted by Ibn 'Abbas through a different chain of narrators. In this version there is no mention of the word qasam (oath). It has the words: "He did not inform him."
Reference : Sunan Abi Dawud 3269In-book reference : Book 22, Hadith 28English translation : Book 21, Hadith 3263