Quran 6:40 from Surah Al-An'aam on Divine Marvels.
قُلۡ أَرَءَيۡتَكُمۡ إِنۡ أَتَىٰكُمۡ عَذَابُ ٱللَّهِ أَوۡ أَتَتۡكُمُ ٱلسَّاعَةُ أَغَيۡرَ ٱللَّهِ تَدۡعُونَ إِن كُنتُمۡ صَٰدِقِينَ
English translation: Say Have you seen if (there) came to you punishment (of) Allah or (there) came to you the Hour is it other (than) Allah you call if you are truthful
Transliteration: qul ara-aytakum in atakum adhabu al-lahi aw atatkumu al-sa'atu aghayra al-lahi tad'una in kuntum sadiqina