Quran 43:81 from Surah Az-Zukhruf on Divine Marvels.
قُلۡ إِن كَانَ لِلرَّحۡمَٰنِ وَلَدٞ فَأَنَا۠ أَوَّلُ ٱلۡعَٰبِدِينَ
English translation: Say If had the Most Gracious a son Then I (would be the) first (of) the worshippers
Transliteration: qul in kana lilrrahmani waladun fa-ana awwalu al-'abidina