"Those whom you invoke besides Allah could never create a single fly, though they combined to do this. And if a fly carried away anything from them, they could never retrieve it. Powerless is the invoker and the invoked" (AI-Hajj;73).
it is recorded by the authors of the Two Sahihs via `Umarah from Abu Zur`ah from Abu Hurayrah, who said that the Prophet said:
قَالَ اللهُ عَزَّ وَجَلَّ وَمَنْ أَظْلَمُ مِمَّنْ ذَهَبَ يَخْلُقُ كَخَلْقِي، فَلْيَخْلُقُوا ذَرَّةً، فَلْيَخْلُقُوا شَعِيرَة
Allah says: "Who does more wrong than one who tries to create (something) like My creation! Let them create an ant, let them create a grain of barley.''
Then Allah says:
... وَإِن يَسْلُبْهُمُ الذُّبَابُ شَيْئًا لَّا يَسْتَنقِذُوهُ مِنْهُ ...
And if the fly snatches away a thing from them, they will have no power to release it from the fly.
They are unable to create a single fly and, moreover, they are unable to resist it or take revenge against it if it were to take anything from the good and perfumed thing on which it lands. If they wanted to recover that, they would not be able to, even though the fly is the weakest and most insignificant of Allah's creatures.