Quran 36:14 from Surah Yaseen on Divine Marvels.
إِذۡ أَرۡسَلۡنَآ إِلَيۡهِمُ ٱثۡنَيۡنِ فَكَذَّبُوهُمَا فَعَزَّزۡنَا بِثَالِثٖ فَقَالُوٓاْ إِنَّآ إِلَيۡكُم مُّرۡسَلُونَ
English translation: When We sent to them two (Messengers) but they denied both of them so We strengthened them with a third and they said Indeed We to you (are) Messengers
Transliteration: idh arsalna ilayhimu ith'nayni fakadhabuhuma fa'azzazna bithalithin faqalu inna ilaykum mur'saluna