Quran 7:134 from Surah Al-A'raaf on Divine Marvels.
وَلَمَّا وَقَعَ عَلَيۡهِمُ ٱلرِّجۡزُ قَالُواْ يَٰمُوسَى ٱدۡعُ لَنَا رَبَّكَ بِمَا عَهِدَ عِندَكَۖ لَئِن كَشَفۡتَ عَنَّا ٱلرِّجۡزَ لَنُؤۡمِنَنَّ لَكَ وَلَنُرۡسِلَنَّ مَعَكَ بَنِيٓ إِسۡرَٰٓءِيلَ
English translation: And when fell on them the punishment they said O Musa! Invoke for us your Lord by what He has promised to you If you remove from us the punishment surely we will believe [for] you and surely we will send with you (the) Children (of) Israel
Transliteration: walamma waqa'a alayhimu al-rij'zu qalu yamusa ud'u lana rabbaka bima ahida indaka la-in kashafta anna al-rij'za lanu'minanna laka walanur'silanna ma'aka bani is'raila