Surah Al-Ra’d (الرعد) – Verse 43

وَيَقُولُ الَّذِينَ كَفَرُواْ لَسْتَ مُرْسَلاً قُلْ كَفَى بِاللَّهِ شَهِيدًا بَيْنِي وَبَيْنَكُمْ وَمَنْ عِندَهُ عِلْمُ الْكِتَابِ

Transliteration:

Wa yaqūlu alladhīna kafarū lasta mursalan, qul kafā bi-llāhi shahīdan baynī wa baynakum wa man ʿindahu ʿilmu al-kitāb.

Translation:

The faithless say, ‘You have not been sent (by Allah).’ Say, ‘Allah suffices as a witness between me and you, and he who possesses the knowledge of the Book.’