Sunan an-Nasa'i 1441
سنن النسائي#1441Sahihأَخْبَرَنِي مُحَمَّدُ بْنُ وَهْبٍ، قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ سَلَمَةَ، قَالَ حَدَّثَنِي أَبُو عَبْدِ الرَّحِيمِ، قَالَ حَدَّثَنِي زَيْدٌ، عَنْ أَيُّوبَ، - وَهُوَ ابْنُ عَائِذٍ - عَنْ بُكَيْرِ بْنِ الأَخْنَسِ، عَنْ مُجَاهِدٍ أَبِي الْحَجَّاجِ، عَنِ ابْنِ عَبَّاسٍ، قَالَ فُرِضَتْ صَلاَةُ الْحَضَرِ عَلَى لِسَانِ نَبِيِّكُمْ صلى الله عليه وسلم أَرْبَعًا وَصَلاَةُ السَّفَرِ رَكْعَتَيْنِ وَصَلاَةُ الْخَوْفِ رَكْعَةً .
It was narrated that Ibn 'Abbas said:"The prayer of the resident was enjoined on the tongue of your Prophet (ﷺ), four (rak'ahs), and the prayer of the traveler is two rak'ahs, and the prayer of fear is one rak'ah
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 15:9