Surah Al-Furqan 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’ān] is not except a falsehood he invented, and another people assisted him in it." But they have committed an injustice and a lie.

Translation: Saheeh International

Tafsir

And those who disbelieve say ‘This Qur’ān is nothing but a calumny a lie that he Muhammad (s) has invented and other folk have helped him with it’ who according to the disbelievers were from among the People of the Scripture. …

Excerpt from Tafsir al-Jalalayn, commentary on 25:4, via Quran.com. The reader has the full commentary and 9 more tafsirs.