Surah 17. Al-Israa, Ayah 107

Lit., "before it" - i.e., before the Qur'an as such has come within their ken.

 i.e., the faithful among the scholars of the Torah and the Gospel.

No one's belief or unbelief affects the beauty or grandeur of Allah's revelation. But those endowed with spiritual knowledge or insight know at once when they hear Allah's holy Word, and fall down and adore Allah. Those endowed with knowledge include those who had received previous revelations and had kept themselves free from corrupt ideas.