Sunan Abi Dawud 910
سنن أبي داود#910Sahihحَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا أَبُو الأَحْوَصِ، عَنِ الأَشْعَثِ، - يَعْنِي ابْنَ سُلَيْمٍ - عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْتِفَاتِ الرَّجُلِ فِي الصَّلاَةِ فَقَالَ " إِنَّمَا هُوَ اخْتِلاَسٌ يَخْتَلِسُهُ الشَّيْطَانُ مِنْ صَلاَةِ الْعَبْدِ " .
‘A’ishah said:I asked the Messenger of Allah(ﷺ) about looking to the sides during prayer. He said: It is something which the devil snatches from a servant’s prayers
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: 2:521