Abu Hurairah reported,
Ubayy bin Kaab reported that the Messenger of Allah ﷺ said, "Allah 
has not revealed in the Torah or the Gospel anything like the Mother of the Quran. It is the Seven Oft-Repeated Verses, and it is divided between Me and My servant, and My servant shall have what he asks for."
Nasai 915
Hasanأخبرنا الحسين بن حريث قال حدثنا الفضل بن موسى عن عبد الحميد بن جعفر عن العلاء بن عبد الرحمن عن أبيه
عن أبي هريرة
عن أبي بن كعب قال قال رسول الله ﷺ ما أنزل الله عز وجل في التوراة ولا في الإنجيل مثل أم القرآن وهي السبع المثاني وهي مقسومة بيني وبين عبدي ولعبدي ما سأل
, "And We have certainly given you seven of the often repeated verses and the great Quran", "And We have certainly given you seven of the often repeated verses and the great Quran"Its isnad is hasan. Tirmidhi transmitted it in the tafsir of the Quran, chapter on Surah Hijr, no. 3125, from Husayn bin Hurayth, with this wording. It is also found in al-Kubra, no. 986. Ibn Khuzayma graded it sahih, no. 501, as did Ibn Hibban, no. 1714, and Hakim, 1/557, saying it meets the standard of Muslim, and Dhahabi agreed with him.