Surah An-Nur (The Light), Verse 39

وَالَّذِیْنَ كَفَرُوْۤا اَعْمَالُهُمْ كَسَرَابٍۭ بِقِیْعَةٍ یَّحْسَبُهُ الظَّمْاٰنُ مَآءً حَتّٰۤی اِذَا جَآءَهٗ لَمْ یَجِدْهُ شَیْـًٔا وَّوَجَدَ اللّٰهَ عِنْدَهٗ فَوَفّٰىهُ حِسَابَهٗ وَاللّٰهُ سَرِیْعُ الْحِسَابِ ۟

Wallazeena kafarooo a'maaluhum kasaraabim biqee'atiny yahsabuhuz zamaanu maaa'an hattaaa izaa jaaa'ahoo lam yajid hu shai'anw wa wajadal laaha 'indahoo fa waffaahu hisaabah; wallaahu saree'ul hisaab

“But the Unbelievers,- their deeds are like a mirage in sandy deserts, which the man parched with thirst mistakes for water; until when he comes up to it, he finds it to be nothing: But he finds Allah (ever) with him, and Allah will pay him his account: and Allah is swift in taking account.”

Quran 24:39 (Yusuf Ali Translation)