Quran 21:55 — Surah Al-Anbya, ayah 55

قَالُوٓاْ أَجِئۡتَنَا بِٱلۡحَقِّ أَمۡ أَنتَ مِنَ ٱللَّـٰعِبِينَ

They said, "Have you come to us with truth, or are you of those who jest

"Govoriš li ti to ozbiljno ili se samo šališ?" – upitaše oni.