Bilal, narrate to me which act at the time of morning prayer you did in Islam for which you hope to receive good reward, for I heard during the night the sound of your steps before me in Paradise. Bilal said: I did not do any act in Islam for which I hope to get any benefit but this that when I perform complete ablution during the night or day I observe prayer with that purification what Allah has ordained for me to pray.  

قَالَ رَسُولُ اللَّهِ ﷺ لِبِلاَلٍ عِنْدَ صَلاَةِ الْغَدَاةِ يَا بِلاَلُ حَدِّثْنِي بِأَرْجَى عَمَلٍ عَمِلْتَهُ عِنْدَكَ فِي الإِسْلاَمِ مَنْفَعَةً فَإِنِّي سَمِعْتُ اللَّيْلَةَ خَشْفَ نَعْلَيْكَ بَيْنَ يَدَىَّ فِي الْجَنَّةِ قَالَ بِلاَلٌ مَا عَمِلْتُ عَمَلاً فِي الإِسْلاَمِ أَرْجَى عِنْدِي مَنْفَعَةً مِنْ أَنِّي لاَ أَتَطَهَّرُ طُهُورًا تَامًّا فِي سَاعَةٍ مِنْ لَيْلٍ وَلاَ نَهَارٍ إِلاَّ صَلَّيْتُ بِذَلِكَ الطُّهُورِ مَا كَتَبَ اللَّهُ لِي أَنْ أُصَلِّيَ