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 ﷺ فَقَرَأَ عَلَيْنَا { سُورَةٌ أَنْزَلْنَاهَا وَفَرَضْنَاهَا } . قَالَ أَبُو دَاوُدَ يَعْنِي مُخَفَّفَةً حَتَّى أَتَى عَلَى هَذِهِ الآيَاتِ .