Mu'adh b. ‘Abdallah. al-Juhani said that a man of Juhaina told him he had heard God’s Messenger reciting "When the earth is shaken”(Al-Qur’an; 99) in both <i>rak'as</i> of the morning prayer, but did not know whether he had forgotten, or whether he recited it on purpose. Abu Dawud transmitted it.

عَن معَاذ بن عبد الله الْجُهَنِيّ قَالَ: إِنَّ رَجُلًا مِنْ جُهَيْنَةَ أَخْبَرَهُ أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: قَرَأَ فِي الصُّبْح (إِذا زلزلت) فِي الرَّكْعَتَيْنِ كلتهما فَلَا أَدْرِي أَنَسِيَ أَمْ قَرَأَ ذَلِكَ عَمْدًا. رَوَاهُ أَبُو دَاوُد