(136) باب الرَّجُلِ يُعِيدُ سُورَةً وَاحِدَةً فِي الرَّكْعَتَيْنِ
Narrated Mu'adh ibn Abdullah al-Juhani:
A man of Juhaynah told him that he had heard the Prophet (ﷺ) reciting "When the earth is shaken" (Surah 99) in both rak'ahs of the morning prayer. But I do not know whether he had forgotten, or whether he recited it on purpose.
Reference: Sunan Abi Dawud 816
In-book reference: Book 2, Hadith 426
English translation: Book 3, Hadith 815