Quran 57:8 from Surah Al-Hadid on Divine Marvels.
وَمَا لَكُمۡ لَا تُؤۡمِنُونَ بِٱللَّهِ وَٱلرَّسُولُ يَدۡعُوكُمۡ لِتُؤۡمِنُواْ بِرَبِّكُمۡ وَقَدۡ أَخَذَ مِيثَٰقَكُمۡ إِن كُنتُم مُّؤۡمِنِينَ
English translation: And what (is) for you (that) not you believe in Allah while the Messenger calls you that you believe in your Lord and indeed He has taken your covenant if you are believers
Transliteration: wama lakum la tu'minuna bil-lahi wal-rasulu yad'ukum litu'minu birabbikum waqad akhadha mithaqakum in kuntum mu'minina