Surah Az-Zumar, ayah 2

إِنَّآ أَنزَلۡنَآ إِلَيۡكَ ٱلۡكِتَٰبَ بِٱلۡحَقِّ فَٱعۡبُدِ ٱللَّهَ مُخۡلِصٗا لَّهُ ٱلدِّينَ ٢

Innā anzalnā ilaykal-kitāba bil-haqqi fa'budillāha mukhlisal lahud-dīn

Indeed, We have sent down to you the Book, [O Muḥammad], in truth. So worship Allāh, [being] sincere to Him in religion.