Straight, to warn of severe punishment from Him and to give Herald to the believers who do righteous deeds that they will have the Best reward.
The Book is sent down into you so as not to have in your chest any difficulty due to it, It is the Warning and Advice for the believers as explained in verse 7: 2. The Book which We have revealed upon you to bring mankind from the darknesses into the Light with the Lord’s Permission to the path of the Exalted, the Self praiseworthy as explained in verse 14: 1. Adhikr is the Permission of Lord, only with It one will become a believer as explained in verse 10: 100. Adhikr is Guidance and Light for the entire mankind, and those who follow It will only succeed as explained in verses 7: 157-158.
Lord’s curse is upon the Arabic Quran reading hypocrites who make Lord’s path crooked and who obstruct mankind from Adhikr as explained in verses 7: 45 and 11: 18-19. See explanation 9: 67-68, 71-72, and 17: 9.