Allah SWT says: إِنَّ اللَّهَ لَا يَسْتَحْىِۦٓ أَنْ يَضْرِبَ مَثَلًا مَّا بَعُوضَةً فَمَا فَوْقَهَا ۚ فَأَمَّا الَّذِينَ ءَامَنُوا فَيَعْلَمُونَ أَنَّهُ الْحَقُّ مِنْ رَّبِّهِمْ ۖ وَأَمَّا الَّذِينَ كَفَرُوا فَيَقُولُونَ مَاذَآ أَرَادَ اللَّهُ بِهٰذَا مَثَلًا ۘ يُضِلُّ بِهِۦ كَثِيرًا وَيَهْدِى بِهِۦ كَثِيرًا ۚ وَمَا يُضِلُّ بِهِۦٓ إِلَّا الْفٰسِقِينَ "Indeed, Allah is not timid to present an example - that of a mosquito or what is smaller than it. And those who have believed know that it is the truth from their Lord. But as for those who disbelieve, they say, What did Allah intend by this as an example? He misleads many thereby and guides many thereby. And He misleads not except the defiantly disobedient," (QS. Al-Baqara 2: Verse 26) * Via Qur'an English http://quran-en.com