"Indeed, upon Us is the guidance," meaning: We will clarify for you the path of guidance and the path of misguidance.
(إِن علينا للهدى﴾ أَيْ: نُبَيِّنُ لَكُمْ سَبِيلَ الْهُدَى وسبيل الضَّلَالَة.