Surah Hud (Hud), Verse 93

وَیٰقَوْمِ اعْمَلُوْا عَلٰی مَكَانَتِكُمْ اِنِّیْ عَامِلٌ سَوْفَ تَعْلَمُوْنَ مَنْ یَّاْتِیْهِ عَذَابٌ یُّخْزِیْهِ وَمَنْ هُوَ كَاذِبٌ وَارْتَقِبُوْۤا اِنِّیْ مَعَكُمْ رَقِیْبٌ ۟

Wa yaa qawmi' maloo 'alaa makaanatikum innee 'aamilun sawfa ta'lamoona many ya'teehi 'azaabuny yukhzeehi wa man huwa kaazib; wartaqibooo innnee ma'akum raqeeb

“"And O my people! Do whatever ye can: I will do (my part): Soon will ye know who it is on whom descends the penalty of ignominy; and who is a liar! and watch ye! for I too am watching with you!"”

Quran 11:93 (Yusuf Ali Translation)