Sunan an-Nasa'i 1436
سنن النسائي#1436Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا ابْنُ عَوْنٍ، عَنْ مُحَمَّدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ كُنَّا نَسِيرُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم بَيْنَ مَكَّةَ وَالْمَدِينَةِ لاَ نَخَافُ إِلاَّ اللَّهَ عَزَّ وَجَلَّ نُصَلِّي رَكْعَتَيْنِ .
It was narrated that Ibn 'Abbas said:"We used to travel with the Messenger of Allah (ﷺ) between Makkah and Al-Madinah, fearing nothing but Allah, the Mighty and Sublime, and praying two rak'ahs
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: 15:4