Sunan an-Nasa'i 1435
سنن النسائي#1435Sahihأَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا هُشَيْمٌ، عَنْ مَنْصُورِ بْنِ زَاذَانَ، عَنِ ابْنِ سِيرِينَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم خَرَجَ مِنْ مَكَّةَ إِلَى الْمَدِينَةِ لاَ يَخَافُ إِلاَّ رَبَّ الْعَالَمِينَ يُصَلِّي رَكْعَتَيْنِ .
It was narrated from Ibn 'Abbas that:The Messenger of Allah (ﷺ) set out from Makkah to Al-Madinah, fearing nothing but the Lord of the worlds, 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:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 15:3