وَقَالَ الَّذِينَ كَفَرُوا إِنْ هَذَا إِلَّا إِفْكٌ افْتَرَاهُ وَأَعَانَهُ عَلَيْهِ قَوْمٌ آخَرُونَ فَقَدْ جَاءُوا ظُلْمًا وَزُورًا
The faithless say, ‘This is nothing but a lie that he has fabricated, and other people have abetted him in it.’ Thus they have certainly come out with wrongdoing and falsehood.
Agha Ali Puya Commentary
Commentary on Quran 25:4
[Pooya/Ali Commentary 25:4] The disbelievers said that the Quran was invented by the Holy Prophet with the aid of other people, the Jews and the Christians. In fact their charges were false. They resorted to falsehood due to their habit of iniquity.