Sunan an Nasai 1336
The Book of Forgetfulness (In Prayer)
أَخْبَرَنَا مُحَمَّدُ بْنُ سَلَمَةَ، قَالَ حَدَّثَنَا ابْنُ وَهْبٍ، عَنِ اللَّيْثِ، عَنْ حُنَيْنِ بْنِ أَبِي حَكِيمٍ، عَنْ عُلَىِّ بْنِ رَبَاحٍ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ أَمَرَنِي رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ أَقْرَأَ الْمُعَوِّذَاتِ دُبُرَ كُلِّ صَلاَةٍ .
It was narrated that 'Uqbah bin 'Amr said:"The Messenger of Allah (ﷺ) commanded me to recite Al-Mu'awwidhat following every prayer
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Isnaad Hasan
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.