Sunan Abi Dawud, Book 3, Hadith 792 (USC-MSA) ⓘ
Narrated Some Companions of the Prophet: AbuSalih reported on the authority of some Companions of the Prophet: The Prophet said to a person: what do you say in prayer? He replied: I first recite tashahhud (supplication recited in sitting position), and then I say: O Allah, I ask Thee for Paradise, and I seek refuge in Thee from Hell-Fire, but I do not understand your sound and the sound of Mu'adh (what you say or he says in prayer). The Prophet said: We too go around it (paradise and Hell-fire).
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا حُسَيْنُ بْنُ عَلِيٍّ، عَنْ زَائِدَةَ، عَنْ سُلَيْمَانَ، عَنْ أَبِي صَالِحٍ، عَنْ بَعْضِ، أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لِرَجُلٍ " كَيْفَ تَقُولُ فِي الصَّلاَةِ " . قَالَ أَتَشَهَّدُ وَأَقُولُ اللَّهُمَّ إِنِّي أَسْأَلُكَ الْجَنَّةَ وَأَعُوذُ بِكَ مِنَ النَّارِ أَمَا إِنِّي لاَ أُحْسِنُ دَنْدَنَتَكَ وَلاَ دَنْدَنَةَ مُعَاذٍ . فَقَالَ النَّبِيُّ صلى الله عليه وسلم " حَوْلَهَا نُدَنْدِنُ " .
also referenced under: Hadith 792 (DarusSalam) & Hadith 792 (Hasan)