Sunan an-Nasa'i 1272
سنن النسائي#1272Sahihأَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا صَفْوَانُ بْنُ عِيسَى، قَالَ حَدَّثَنَا ابْنُ عَجْلاَنَ، عَنِ الْقَعْقَاعِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَجُلاً، كَانَ يَدْعُو بِأُصْبُعَيْهِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَحِّدْ أَحِّدْ " .
It was narrated from Abu Hurairah that:A man used to supplicate with two fingers and the Messenger of Allah (ﷺ) said: "Make it one, make it one
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 ZaiDaif
In-book reference: 13:94