Hadith 5

The Prophet is reported to have said, “The prayer is not valid for the one who does not recite the Fātiḥah (opening chapter) of the Book.” Reference: Sahih Muslim 394

عَنْ عُبَادَةَ بْنِ الصَّامِتِ، يَبْلُغُ بِهِ النَّبِيَّ صلى الله عليه وسلم ‏ "‏ لاَ صَلاَةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ ‏" ‏.

Reference: 1540040
In-book reference: Book 1, Hadith 5