In a prophecy to the Virgin Mary before the birth of Jesus the Messiah (peace be upon him), Allaah announces:
وَيُعَلِّمُهُ الْكِتَابَ وَالْحِكْمَةَ وَالتَّوْرَاةَ وَالإِنجِيلَ
And He (Allaah) will teach him (Jesus) the Book, and the Wisdom, and the Torah, and the Gospel [3:48]
If, as the "Quraan-only" group claims, that Al-Hikmah (the Wisdom) is the same thing as the Quraan, why has Allaah enumerated four different things which He will give knowledge of to Jesus?
It is obvious that the Torah and the Gospel are not the same, they are two different revelations that Allaah gave knowledge of to Jesus.
In addition, Allaah says He will also give knowledge of the Book, meaning the Quraan, and the Wisdom, meaning the Sunnah, to Jesus.
Since Torah and Gospel are different things, therefore it is proven that all these four things which Allaah has mentioned (Al-Kitaab, Al-Hikmah, At-Tawrah, and Al-Injeel) are separate and distinct revelations. They are not the same thing or four different titles of the same book!
The Gospel and the Torah are different revelations, therefore, the Kitaab and the Hikmah are also different revelations.
Coincidentally, this verse is also a proof that Jesus is still alive and will descend at his second coming, with correct knowledge of the Kitaab (Quraan), and the Hikmah (Sunnah).