Sunan an-Nasa'i 185
سنن النسائي#185Sahihأَخْبَرَنَا عَمْرُو بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا عَلِيُّ بْنُ عَيَّاشٍ، قَالَ حَدَّثَنَا شُعَيْبٌ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، قَالَ سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ، قَالَ كَانَ آخِرَ الأَمْرَيْنِ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم تَرْكُ الْوُضُوءِ مِمَّا مَسَّتِ النَّارُ .
It was reported that Jabir (ra) said "That last of the two matters from the Messenger ofAllah (ﷺ) was leaving off ablution from that which had been touched by fire
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 ZaiIsnaad Sahih
In-book reference: 1:186