Quran 43, Az-Zukhruf (Gold Ornaments)

43:81Say (O Muhammad): If the Beneficent One hath a son, then, I shall be first among the worshippers. (But there is no son).

قُلْ إِنْ كَانَ لِلرَّحْمَنِ وَلَدٌ فَأَنَا أَوَّلُ الْعَابِدِينَ