What is to be said during the Tashah-hud and sending Salat upon the Prophet (saws) Sunan Ibn Majah 910

Arabic hadith text
حَدَّثَنَا يُوسُفُ بْنُ مُوسَى الْقَطَّانُ، حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ لِرَجُلٍ ‏"‏ مَا تَقُولُ فِي الصَّلاَةِ ‏"‏ ‏.‏ قَالَ أَتَشَهَّدُ ثُمَّ أَسْأَلُ اللَّهَ الْجَنَّةَ وَأَعُوذُ بِهِ مِنَ النَّارِ أَمَا وَاللَّهِ مَا أُحْسِنُ دَنْدَنَتَكَ وَلاَ دَنْدَنَةَ مُعَاذٍ ‏.‏ فَقَالَ ‏"‏ حَوْلَهُمَا نُدَنْدِنُ ‏"
Translation
It wasnarrated that Abu Hurairah said

“The Messenger of Allah (ﷺ)saidto a man: ‘What do you say during your Salat?’ He said: ‘TheTashah-hud, then I ask Allah for Paradise, and I seek refuge with Himfrom Hell, but I do not understand what you and Mu’adh murmur(duringSalat). He said: ‘Our murmuring revolves around the samethings.’”