Yunus 38

أَمْ يَقُولُونَ ٱفْتَرَىٰهُ قُلْ فَأْتُوا۟ بِسُورَةٍ مِّثْلِهِۦ وَٱدْعُوا۟ مَنِ ٱسْتَطَعْتُم مِّن دُونِ ٱللَّهِ إِن كُنتُمْ صَٰدِقِينَ ﴿٣٨﴾

Am yaqooloona iftarahu qul fatoo bisooratin mithlihi waodAAoo mani istataAAtum min dooni Allahi in kuntum sadiqeena

Or do they say: "He (Muhammad SAW) has forged it?" Say: "Bring then a Surah (chapter) like unto it, and call upon whomsoever you can, besides Allah, if you are truthful!" The Noble Quran