Surah Adh-Dhariyat, ayah 56

وَمَا خَلَقۡتُ ٱلۡجِنَّ وَٱلۡإِنسَ إِلَّا لِيَعۡبُدُونِ ٥٦

Wamā khalaqtul-jinna wal-insa illā liya'budūn

And I did not create the jinn and mankind except to worship Me.