25:4
وَقَالَ ٱلَّذِينَ كَفَرُوٓا۟ إِنْ هَـٰذَآ إِلَّآ إِفْكٌ ٱفْتَرَىٰهُ وَأَعَانَهُۥ عَلَيْهِ قَوْمٌ ءَاخَرُونَ ۖ فَقَدْ جَآءُو ظُلْمًا وَزُورًا
waqāla alladhīna kafarū in hādhā illā if'kun if'tarāhu wa-aʿānahu ʿalayhi qawmun ākharūna faqad jāū ẓul'man wazūran
The disbelievers say, ‘This can only be a lie he has forged with the help of others’––they themselves have done great wrong and told lies––
Those who disbelieve say: "This (the Qur’ân) is nothing but a lie that he (Muhammad صلى الله عليه وسلم) has invented, and others have helped him at it. In fact they have produced an unjust wrong (thing) and a lie."