Quran 7:89 from Surah Al-A'raaf on Divine Marvels.
قَدِ ٱفۡتَرَيۡنَا عَلَى ٱللَّهِ كَذِبًا إِنۡ عُدۡنَا فِي مِلَّتِكُم بَعۡدَ إِذۡ نَجَّىٰنَا ٱللَّهُ مِنۡهَاۚ وَمَا يَكُونُ لَنَآ أَن نَّعُودَ فِيهَآ إِلَّآ أَن يَشَآءَ ٱللَّهُ رَبُّنَاۚ وَسِعَ رَبُّنَا كُلَّ شَيۡءٍ عِلۡمًاۚ عَلَى ٱللَّهِ تَوَكَّلۡنَاۚ رَبَّنَا ٱفۡتَحۡ بَيۡنَنَا وَبَيۡنَ قَوۡمِنَا بِٱلۡحَقِّ وَأَنتَ خَيۡرُ ٱلۡفَٰتِحِينَ
English translation: Verily we would have fabricated against Allah a lie if we returned in your religion after [when] saved us Allah from it And not it is for us that we return in it except that wills Allah our Lord Encompasses (by) Our Lord every thing (in) knowledge Upon Allah we put our trust Our Lord Decide between us and between our people in truth and You (are the) Best (of) those who Decide
Transliteration: qadi if'tarayna ala al-lahi kadhiban in ud'na fi millatikum ba'da idh najjana al-lahu min'ha wama yakunu lana an na'uda fiha illa an yashaa al-lahu rabbuna wasi'a rabbuna kulla shayin il'man ala al-lahi tawakkalna rabbana if'tah baynana wabayna qawmina bil-haqi wa-anta khayru al-fatihina