Sunan an-Nasa'i 1229
سنن النسائي#1229Sahihأَخْبَرَنَا هَارُونُ بْنُ مُوسَى الْفَرْوِيُّ، قَالَ حَدَّثَنِي أَبُو ضَمْرَةَ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي أَبُو سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ نَسِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَسَلَّمَ فِي سَجْدَتَيْنِ . فَقَالَ لَهُ ذُو الشِّمَالَيْنِ أَقُصِرَتِ الصَّلاَةُ أَمْ نَسِيتَ يَا رَسُولَ اللَّهِ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَصَدَقَ ذُو الْيَدَيْنِ " . قَالُوا نَعَمْ . فَقَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَأَتَمَّ الصَّلاَةَ .
It was narrated that Abu Hurairah said:"The Messenger of Allah (ﷺ) forgot and said the taslim after two rak'ahs. Dhul-Shimalain said to him: 'Has the prayer been shortened or did you forget, O Messenger of Allah (ﷺ)?' The Messenger of Allah (ﷺ) said: 'Is Dhul-Yadain speaking the truth?' They said: "Yes." So the Messenger of Allah (ﷺ) stood up and completed the prayer
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: 13:51