The Prophet (ﷺ) called As-Salat a deed and said, “Whoever does not recite Al-Fatiha of the Book in his Salat, his Salat is invalid

Sahih al-Bukhari · Book 97 · Hadith 7534

حَدَّثَنِي سُلَيْمَانُ، حَدَّثَنَا شُعْبَةُ، عَنِ الْوَلِيدِ،‏.‏ وَحَدَّثَنِي عَبَّادُ بْنُ يَعْقُوبَ الأَسَدِيُّ، أَخْبَرَنَا عَبَّادُ بْنُ الْعَوَّامِ، عَنِ الشَّيْبَانِيِّ، عَنِ الْوَلِيدِ بْنِ الْعَيْزَارِ، عَنْ أَبِي عَمْرٍو الشَّيْبَانِيِّ، عَنِ ابْنِ مَسْعُودٍ ـ رضى الله عنه ـ أَنَّ رَجُلاً، سَأَلَ النَّبِيَّ صلى الله عليه وسلم أَىُّ الأَعْمَالِ أَفْض…

Narrated Ibn Mas`ud: A man asked the Prophet (ﷺ) "What deeds are the best?" The Prophet (ﷺ) said: "(1) To perform the (daily compulsory) prayers at their (early) stated fixed times, (2) to be good and dutiful to one's o…