(11) باب وُجُوبِ قِرَاءَةِ الْفَاتِحَةِ فِي كُلِّ رَكْعَةٍ وَإِنَّهُ إِذَا لَمْ يُحْسِنِ الْفَاتِحَةَ وَلاَ أَمْكَنَهُ تَعَلُّمُهَا قَرَأَ مَا تَيَسَّرَ لَهُ مِنْ غَيْرِهَا
Abu Huraira reported:
The Messenger of Allah (ﷺ) said: He who said his prayer, but did not recite the opening chapter of al-Kitab, his prayer is incomplete. He repeated it thrice. (ES)
Reference (ES): Sahih Muslim 395 c (ES)
In-book reference (ES): Book 4, Hadith 43 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 777 (ES)