Quran 6:124 from Surah Al-An'aam on Divine Marvels.
وَإِذَا جَآءَتۡهُمۡ ءَايَةٞ قَالُواْ لَن نُّؤۡمِنَ حَتَّىٰ نُؤۡتَىٰ مِثۡلَ مَآ أُوتِيَ رُسُلُ ٱللَّهِۘ ٱللَّهُ أَعۡلَمُ حَيۡثُ يَجۡعَلُ رِسَالَتَهُۥۗ سَيُصِيبُ ٱلَّذِينَ أَجۡرَمُواْ صَغَارٌ عِندَ ٱللَّهِ وَعَذَابٞ شَدِيدُۢ بِمَا كَانُواْ يَمۡكُرُونَ
English translation: And when comes to them a Sign they say Never we will believe until we are given like what was given (to the) Messengers (of) Allah Allah knows best where He places His Message Will afflict those who committed crimes a humiliation from Allah and a punishment severe for what they used to plot
Transliteration: wa-idha jaathum ayatun qalu lan nu'mina hatta nu'ta mith'la ma utiya rusulu al-lahi al-lahu a'lamu haythu yaj'alu risalatahu sayusibu alladhina ajramu sagharun inda al-lahi wa'adhabun shadidun bima kanu yamkuruna