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. (Using translation from Abū Dāʾūd 816)   

أَخْبَرَهُ أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقْرَأُ فِي صَلَاةِ الصُّبْحِ إِذَا زُلْزِلَتِ الْأَرْضُ فِي الرَّكْعَتَيْنِ كِلْتَيْهِمَا فَلَا أَدْرِي أَنَسِيَ النَّبِيُّ ﷺ أَمْ قَرَأَ ذَلِكَ عَمْدًا وَرُوِّينَا عَنِ النَّبِيِّ ﷺ أَنَّهُ صَلَّى بِالْمُعَوِّذَتَيْنِ صَلَاةَ الصُّبْحِ لِلنَّاسِ وَذَلِكَ يَرِدُ  

[Machine] We went out with Umar ibn Al-Khattab as pilgrims, and he led us in the Fajr prayer. He recited the verse, "Have you not considered how your Lord dealt with the companions of the elephant?"  

خَرَجْنَا مَعَ عُمَرَ بْنِ الْخَطَّابِ ؓ حُجَّاجًا فَصَلَّى بِنَا الْفَجْرَ فَقَرَأَ أَلَمْ تَرَ وَلِإِيلَافِ قُرَيْشٍ  

[Machine] Abdul Rahman bin Auf was stabbed in his foot while leading them in prayer during the dawn prayer. He recited the verse, "When the victory of Allah has come and the conquest, and indeed, We have granted you, [O Muhammad], al-Kawthar."  

طُعِنَ قَدَّمُوا عَبْدَ الرَّحْمَنِ بْنَ عَوْفٍ صَلَّى بِهُمُ الْفَجْرَ فَقَرَأَ إِذَا جَاءَ نَصْرُ اللهِ وَإِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ