What is meant by the Almighty’s saying: "And We have certainly given you seven of the often-repeated [verses] and the Grand Qur’an" which appears in Surat Al-Hijr, verse 87?

The "Seven Oft-Recited Verses" (Al-Sab' Al-Mathani) and the "Grand Quran" (Al-Quran Al-Azim) refer to Surat Al-Fatihah, as stated in the Hadith of the Messenger of Allah, peace and blessings be upon him, narrated by Al-Bukhari: " 'All praise is due to Allah, the Lord of the worlds' is the Seven Oft-Recited Verses and the Grand Quran which I have been given."