عَنِ الْفَضْلِ بْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((الصَّلَاةُ مَثْنَى مَثْنَى، تَشَهَّدُ فِي كُلِّ رَكْعَتَيْنِ وَتَضَرَّعُ وَتَخَشَّعُ وَتَمَسْكَنُ ثّمَّ تُقْنِعُ يَدَيْكَ تَقُولُ تَرْفَعَهُمَا إِلَى رَبِّكَ مُسْتَقْبِلًا بِبُطُونِهِمَا وَجْهَكَ، تَقُولُ يَا رَبِّ! يَا رَبِّ! فَمَنْ لَمْ يَفْعَلْ ذَلِكَ … )) فَقَالَ فِيهِ قَوْلًا شَدِيدًا
Sayyiduna Fadl bin Abbas (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: Prayer is in sets of two rak‘ahs; in every two rak‘ahs, recite the tashahhud, show humility, adopt submissiveness, and express poverty. Then raise your hands towards your Lord, with the inner part of your palms facing your face, and say: O my Lord! O my Lord! Whoever does not do so, he... (Then the Prophet, peace and blessings be upon him, said something severe about him.)