(11) باب وُجُوبِ قِرَاءَةِ الْفَاتِحَةِ فِي كُلِّ رَكْعَةٍ وَإِنَّهُ إِذَا لَمْ يُحْسِنِ الْفَاتِحَةَ وَلاَ أَمْكَنَهُ تَعَلُّمُهَا قَرَأَ مَا تَيَسَّرَ لَهُ مِنْ غَيْرِهَا
Ubada b. as-Samit reported:
The Messenger of Allah (ﷺ) said: He who does not recite Umm al-Qur'an is not credited with having observed the prayer. (DE)
Reference (DE): Sahih Muslim 394 b (DE)
In-book reference (DE): Book 4, Hadith 38 (DE)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 772 (DE)