25:4
وَقَالَ ٱلَّذِينَ كَفَرُوٓا۟ إِنْ هَـٰذَآ إِلَّآ إِفْكٌ ٱفْتَرَىٰهُ وَأَعَانَهُۥ عَلَيْهِ قَوْمٌ ءَاخَرُونَ ۖ فَقَدْ جَآءُو ظُلْمًا وَزُورًا
And those who disbelieve say, "This [Qur'an] is not except a falsehood he invented, and another people assisted him in it." But they have committed an injustice and a lie.
Context in Surah Al-Furqan
Nearby ayahs help place verse 25:4 in sequence and meaning.
ٱلَّذِى لَهُۥ مُلْكُ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ وَلَمْ يَتَّخِذْ وَلَدًا وَلَمْ يَكُن لَّهُۥ شَرِيكٌ فِى ٱلْمُلْكِ وَخَلَقَ كُلَّ شَىْءٍ فَقَدَّرَهُۥ تَقْدِيرًا
He to whom belongs the dominion of the heavens and the earth and who has not taken a son and has not had a partner in dominion and has created each thing and determined it with [precise] determination.
وَٱتَّخَذُوا۟ مِن دُونِهِۦٓ ءَالِهَةً لَّا يَخْلُقُونَ شَيْـًٔا وَهُمْ يُخْلَقُونَ وَلَا يَمْلِكُونَ لِأَنفُسِهِمْ ضَرًّا وَلَا نَفْعًا وَلَا يَمْلِكُونَ مَوْتًا وَلَا حَيَوٰةً وَلَا نُشُورًا
But they have taken besides Him gods which create nothing, while they are created, and possess not for themselves any harm or benefit and possess not [power to cause] death or life or resurrection.
وَقَالُوٓا۟ أَسَـٰطِيرُ ٱلْأَوَّلِينَ ٱكْتَتَبَهَا فَهِىَ تُمْلَىٰ عَلَيْهِ بُكْرَةً وَأَصِيلًا
And they say, "Legends of the former peoples which he has written down, and they are dictated to him morning and afternoon."
قُلْ أَنزَلَهُ ٱلَّذِى يَعْلَمُ ٱلسِّرَّ فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۚ إِنَّهُۥ كَانَ غَفُورًا رَّحِيمًا
Say, [O Muhammad], "It has been revealed by He who knows [every] secret within the heavens and the earth. Indeed, He is ever Forgiving and Merciful."