Quran 11:93 from Surah Hud on Divine Marvels.
وَيَٰقَوۡمِ ٱعۡمَلُواْ عَلَىٰ مَكَانَتِكُمۡ إِنِّي عَٰمِلٞۖ سَوۡفَ تَعۡلَمُونَ مَن يَأۡتِيهِ عَذَابٞ يُخۡزِيهِ وَمَنۡ هُوَ كَٰذِبٞۖ وَٱرۡتَقِبُوٓاْ إِنِّي مَعَكُمۡ رَقِيبٞ
English translation: And O my people! Work (according) to your position indeed I am working Soon you will know (on) whom will come a punishment (that will) disgrace him and who [he] (is) a liar And watch indeed I am with you a watcher
Transliteration: wayaqawmi i'malu ala makanatikum inni amilun sawfa ta'lamuna man yatihi adhabun yukh'zihi waman huwa kadhibun wa-ir'taqibu inni ma'akum raqibun