Quran 40:28 from Surah Ghafir on Divine Marvels.
وَقَالَ رَجُلٞ مُّؤۡمِنٞ مِّنۡ ءَالِ فِرۡعَوۡنَ يَكۡتُمُ إِيمَٰنَهُۥٓ أَتَقۡتُلُونَ رَجُلًا أَن يَقُولَ رَبِّيَ ٱللَّهُ وَقَدۡ جَآءَكُم بِٱلۡبَيِّنَٰتِ مِن رَّبِّكُمۡۖ وَإِن يَكُ كَٰذِبٗا فَعَلَيۡهِ كَذِبُهُۥۖ وَإِن يَكُ صَادِقٗا يُصِبۡكُم بَعۡضُ ٱلَّذِي يَعِدُكُمۡۖ إِنَّ ٱللَّهَ لَا يَهۡدِي مَنۡ هُوَ مُسۡرِفٞ كَذَّابٞ
English translation: And said a man believing from (the) family (of) Firaun who conceal(ed) his faith Will you kill a man because he says My Lord (is) Allah and indeed he has brought you clear proofs from your Lord And if he is a liar then upon him (is) his lie and if he is truthful (there) will strike you some (of) (that) which he threatens you Indeed Allah (does) not guide (one) who [he] (is) a transgressor a liar
Transliteration: waqala rajulun mu'minun min ali fir'awna yaktumu imanahu ataqtuluna rajulan an yaqula rabbiya al-lahu waqad jaakum bil-bayinati min rabbikum wa-in yaku kadhiban fa'alayhi kadhibuhu wa-in yaku sadiqan yusib'kum ba'du alladhi ya'idukum inna al-laha la yahdi man huwa mus'rifun kadhabun