Quran 10:94 from Surah Yunus on Divine Marvels.
فَإِن كُنتَ فِي شَكّٖ مِّمَّآ أَنزَلۡنَآ إِلَيۡكَ فَسۡـَٔلِ ٱلَّذِينَ يَقۡرَءُونَ ٱلۡكِتَٰبَ مِن قَبۡلِكَۚ لَقَدۡ جَآءَكَ ٱلۡحَقُّ مِن رَّبِّكَ فَلَا تَكُونَنَّ مِنَ ٱلۡمُمۡتَرِينَ
English translation: So if you are in doubt of what We have revealed to you then ask those who (have been) reading the Book before you before you Verily has come to you the truth from your Lord so (do) not be among the doubters
Transliteration: fa-in kunta fi shakkin mimma anzalna ilayka fasali alladhina yaqrauna al-kitaba min qablika laqad jaaka al-haqu min rabbika fala takunanna mina al-mum'tarina