Translation of the verse 30 from Surah Al-Ahqaf : Number of verses 35 - - page 506 - Part 26.
They said: "O our people! Verily! We have heard a Book (this Quran) sent down after Musa (Moses), confirming what came before it, it guides to the truth and to a Straight Path (i.e. Islam).
They said, "O our people, indeed we have heard a [recited] Book revealed after Moses confirming what was before it which guides to the truth and to a straight path.
(46:30) They said: 'Our people, We have heard a Scripture revealed after Moses, verifying the Scriptures revealed before it; it guides to the Truth and to the Straight Way. *34
*34) This shows that these jinns had already had faith in the Prophet Moses and in the Divine Books. After hearing the Qur'an they felt that it gave the same teachings as the former Prophets had been preaching. Therefore, they believed in this Book forthwith and also in the Holy prophet who had brought it.