﴿ كِتَٰبٌ أُنزِلَ إِلَيْكَ فَلَا يَكُن فِى صَدْرِكَ حَرَجٌۭ مِّنْهُ لِتُنذِرَ بِهِۦ وَذِكْرَىٰ لِلْمُؤْمِنِينَ ﴾

“A DIVINE WRIT has been bestowed from on high upon thee -and let there be no doubt about this in thy heart-in order that thou mayest warn [the erring] thereby, and [thus] admonish the believers:”

Please check ayah 7:3 for complete tafsir.