Sunan an-Nasa'i 4167
سنن النسائي#4167Sahihأَخْبَرَنِي هَارُونُ بْنُ مُحَمَّدِ بْنِ بَكَّارِ بْنِ بِلاَلٍ، عَنْ مُحَمَّدٍ، - وَهُوَ ابْنُ عِيسَى بْنِ سُمَيْعٍ - قَالَ حَدَّثَنَا زَيْدُ بْنُ وَاقِدٍ، عَنْ كَثِيرِ بْنِ مُرَّةَ، أَنَّ أَبَا فَاطِمَةَ، حَدَّثَهُ أَنَّهُ، قَالَ يَا رَسُولَ اللَّهِ حَدِّثْنِي بِعَمَلٍ، أَسْتَقِيمُ عَلَيْهِ وَأَعْمَلُهُ . قَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " عَلَيْكَ بِالْهِجْرَةِ فَإِنَّهُ لاَ مِثْلَ لَهَا " .
It was narrated from Kathir bin Murrah that Abu Fatimah told him that he said:"O Messenger of Allah, tell me of an action that I may do and persist in it." The Messenger of Allah said to him: "You should emigrate, for there is nothing like it
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: 39:19