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The Prophet (ﷺ) 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
Source: sunnah.com
Other translations
Arabic
عَنْ عُبَادَةَ بْنِ الصَّامِتِ، يَبْلُغُ بِهِ النَّبِيَّ صلى الله عليه وسلم " لاَ صَلاَةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ " .
sunnah.com