Hadith on Prayer: Prayers are partially rewarded if they lack complete humility and concentration

Amir ibn Yasir رضى الله عنه reported: I heard the Messenger of Allah صلى الله عليه وسلم saying, “Indeed, a person may finish (the prayer) and nothing is recorded for him except a tenth, or a ninth, or an eighth, or a seventh, or a sixth, or a fifth, or a fourth, or a third, or a half.”

[Sunan Abu Dawud, Book 2, Number 796, Grade: Hasan]

عَمَّارِ بْنِ يَاسِرٍ قَالَ  سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ إِنَّ الرَّجُلَ لَيَنْصَرِفُ وَمَا كُتِبَ لَهُ إِلَّا عُشْرُ صَلَاتِهِ تُسْعُهَا ثُمْنُهَا سُبْعُهَا سُدْسُهَا خُمْسُهَا رُبْعُهَا ثُلُثُهَا نِصْفُهَا