[Machine] The Messenger of Allah ﷺ established the Qasr prayer during the year of conquest, reported by Abu Ali al-Rudhbary, informed by Abu Bakr ibn Dasa, narrated by Abu Dawood, narrated by al-Nufayli, narrated by Muhammad ibn Salamah. It was also mentioned and narrated by Irak ibn Malik from the Prophet ﷺ through a Mursal chain. The narration of Ikrimah from Ibn Abbas is the most authentic of all of these, and Allah knows best.  

أَقَامَ رَسُولُ اللهِ ﷺ عَامَ الْفَتْحِ خَمْسَ عَشْرَةَ يَقْصُرُ الصَّلَاةَ أَخْبَرَنَاهُ أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ أَبُو بَكْرِ بْنُ دَاسَةَ ثنا أَبُو دَاوُدَ ثنا النُّفَيْلِيُّ ثنا مُحَمَّدُ بْنُ سَلَمَةَ فَذَكَرَهُ وَرَوَاهُ عِرَاكُ بْنُ مَالِكٍ عَنِ النَّبِيِّ ﷺ مُرْسَلًا وَرِوَايَةُ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ أَصَحُّ مِنْ ذَلِكَ كُلِّهِ وَاللهُ أَعْلَمُ