The Matter of Guidance and other than it is in the Hand of Allah, and Allah's Warning about the Hellfire
Allah's says,
إِنَّ عَلَيْنَا لَلْهُدَى
Truly, on Us is (to give) guidance.
Qatadah said,
"This means, We will explain what is lawful and what is prohibited."
Others have said that it means,
"Whoever traverses upon the path of guidance, then he will reach Allah (i.e., in the Hereafter)."
They consider this Ayah like Allah's saying,
وَعَلَى اللَّهِ قَصْدُ السَّبِيلِ
And upon Allah is the responsibility to explain the Straight path. (16;9)
This has been mentioned by Ibn Jarir.
Allah said;
وَإِنَّ لَنَا لَلْإخِرَةَ وَالاْإُولَى