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It was narrated that Ubayy bin Ka’b said, “The Messenger of Allah (ﷺ) ﷺ said, Allah did not reveal in the Tawrāh or the Injīl anything like Umm al-Quran (al-Fātiḥah), which is the seven oft-recited (verses), and (Allah said) it is divided between Myself and My slave will have what he asked for.” Reference: Jami` at-Tirmidhi 3125
Source: sunnah.com
Other translations
Arabic
عَنْ أُبَىِّ بْنِ كَعْبٍ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَا أَنْزَلَ اللَّهُ فِي التَّوْرَاةِ وَلاَ فِي الإِنْجِيلِ مِثْلَ أُمِّ الْقُرْآنِ وَهِيَ السَّبْعُ الْمَثَانِي وَهِيَ مَقْسُومَةٌ بَيْنِي وَبَيْنَ عَبْدِي وَلِعَبْدِي مَا سَأَلَ" .
sunnah.com