Narrated 'Aishah:The revelation came down to Messenger of Allah (ﷺ) and he recited to is: "A surah which We have sent down and which We have ordained (faradnaha)"Abu Dawud said: The letter ra (r) is the word faradnaha has short vowel a (with out doubling of consonant r), and then he reached the verses after this verse.
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ، عَنْ عُرْوَةَ، أَنَّ عَائِشَةَ، - رضى الله عنها - قَالَتْ نَزَلَ الْوَحْىُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَرَأَ عَلَيْنَا { سُورَةٌ أَنْزَلْنَاهَا وَفَرَضْنَاهَا } . قَالَ أَبُو دَاوُدَ يَعْنِي مُخَفَّفَةً حَتَّى أَتَى عَلَى هَذِهِ الآيَاتِ .
AbuDaud
Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at) • Hadith 4008