Al-Hajj 22:73
يَـٰٓأَيُّهَا ٱلنَّاسُ ضُرِبَ مَثَلٌ فَٱسْتَمِعُوا۟ لَهُۥٓ ۚ إِنَّ ٱلَّذِينَ تَدْعُونَ مِن دُونِ ٱللَّهِ لَن يَخْلُقُوا۟ ذُبَابًا وَلَوِ ٱجْتَمَعُوا۟ لَهُۥ ۖ وَإِن يَسْلُبْهُمُ ٱلذُّبَابُ شَيْـًٔا لَّا يَسْتَنقِذُوهُ مِنْهُ ۚ ضَعُفَ ٱلطَّالِبُ وَٱلْمَطْلُوبُ
Ya ayyuha annasuduriba mathalun fastamiAAoo lahu inna allatheenatadAAoona min dooni Allahi lan yakhluqoo thubabanwalawi ijtamaAAoo lahu wa-in yaslubuhumu aththubabushay-an la yastanqithoohu minhu daAAufa attalibuwalmatloob
"O people, an example is presented, so listen to it. Indeed, those you invoke besides Allāh will never create [as much as] a fly, even if they gathered together for it [i.e., that purpose]. And if the fly should steal from them a [tiny] thing, they could not recover it from him. Weak are the pursuer and pursued."
Al-Hajj 22:73, translation by Sahih International
A short reflection
O mankind, a parable has been struck. Those whom you call upon besides Allah will never create a fly, even if they gathered for it.