﴿ إِنَّآ أَنزَلْنَآ إِلَيْكَ ٱلْكِتَٰبَ بِٱلْحَقِّ فَٱعْبُدِ ٱللَّهَ مُخْلِصًۭا لَّهُ ٱلدِّينَ ﴾

“for, behold, it is We who have bestowed this revela­tion upon thee from on high, setting forth the truth: so worship Him, sincere in thy faith in Him alone!”

Please check ayah 39:4 for complete tafsir.