إِنَّ اللَّهَ لاَ يَسْتَحْيِي أَن يَضْرِبَ مَثَلاً مَّا بَعُوضَةً فَمَا فَوْقَهَا فَأَمَّا الَّذِينَ آمَنُواْ فَيَعْلَمُونَ أَنَّهُ الْحَقُّ مِن رَّبِّهِمْ وَأَمَّا الَّذِينَ كَفَرُواْ فَيَقُولُونَ مَاذَا أَرَادَ اللَّهُ بِهَذَا مَثَلاً يُضِلُّ بِهِ كَثِيراً وَيَهْدِي بِهِ كَثِيراً وَمَا يُضِلُّ بِهِ إِلاَّ الْفَاسِقِينَ
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سورة البقرة
(2/26) Surely Allah is not ashamed to set forth a parable even of a mosquito (a gnat) or any thing above that; then as for those who are âmenû (who believe, who wish to reach Allah while they are living), they know that it is the truth from their Lord, and as for those who disbelieve, they say: “What is it that Allah means by this parable”? By it He misleads (He leaves) many in Misguidance, and many He guides thereby. And he misleads thereby only those who are “Al-Fâsiqûn” (the ones who are not in the Way of Allah or who have gone out of it).
Surah Al-Baqarah