وَيَا قَوْمِ اعْمَلُوا عَلَىٰ مَكَانَتِكُمْ إِنِّي عَامِلٌ ۖ سَوْفَ تَعْلَمُونَ مَنْ يَأْتِيهِ عَذَابٌ يُخْزِيهِ وَمَنْ هُوَ كَاذِبٌ ۖ وَارْتَقِبُوا إِنِّي مَعَكُمْ رَقِيبٌ

Surah Hud : 93
And O my people, work according to your position; indeed, I am working. You are going to know to whom will come a punishment that will disgrace him and who is a liar. So watch; indeed, I am with you a watcher, [awaiting the outcome]."

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