Surah Az-Zukhruf, ayah 81

قُلۡ إِن كَانَ لِلرَّحۡمَٰنِ وَلَدٞ فَأَنَا۠ أَوَّلُ ٱلۡعَٰبِدِينَ ٨١

Qul in kāna lir-rahmāni waladun fa ana awwalul-'ābidīn

Say, [O Muḥammad], "If the Most Merciful had a son, then I would be the first of [his] worshippers."¹⁴⁵¹