Messenger of Allah (S) said: "As-Salat is two and two, with a Tashahhud for every two Rakʿah, with humility, imploring, having a sense of tranquility, pleading and showing helplessness and stretching out your hand" - he said: raising them - "to your Lord, with the insides of them facing your face, saying: 'O Lord! O Lord! And whoever does not do this, then it is like this or that." (Using translation from Tirmidhī 385)   

قَالَ رَسُولُ اللهِ ﷺ الصَّلَاةُ مَثْنَى مَثْنَى تَشَهَّدُ فِي كُلِّ رَكْعَتَيْنِ وَتَضَرَّعُ وَتَخَشَّعُ وَتَمَسْكَنُ وَتُقْنِعُ يَدَيْكَ يَقُولُ تَرْفَعُهُمَا إِلَى رَبِّكَ مُسْتَقْبِلًا بِبُطُونِهِمَا وَجْهَكَ وَتَقُولُ يَا رَبِّ يَا رَبِّ فَمَنْ لَمْ يَفْعَلْ ذَلِكَ كَذَا وَكَذَا يَعْنِي خِدَاجٌ خَالَفَهُ شُعْبَةُ بْنُ الْحَجَّاجِ  

[Machine] On the authority of the Messenger of Allah ﷺ who said, "Prayer is two by two, and you should bear witness in every two units of prayer. It is to be calm and composed, hold your hands together, and say, 'O Allah, O Allah.' Whoever does not do that, then it is incomplete." Abu Abdul Rahman said, "We do not know anyone who narrated this hadith except Al-Layth and Shu'bah, and they differ in their opinions on it."  

عَنْ رَسُولِ اللهِ ﷺ قَالَ الصَّلَاةُ مَثْنَى مَثْنَى وَتَشَهَّدُ فِي كُلِّ رَكْعَتَيْنِ وَتَبَأَّسُ وَتَمَسْكَنُ وَتُقْنِعُ يَدَيْكَ وَتَقُولُ «اللهُمَّ اللهُمَّ فَمَنْ لَمْ يَفْعَلْ ذَلِكَ فَهِي خِدَاجٌ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ مَا نَعْلَمُ أَحَدًا رَوَى هَذَا الْحَدِيثَ غَيْرَ اللَّيْثِ وَشُعْبَةَ عَلَى اخْتِلَافِهِمَا فِيهِ