Dr. Mustafa Khattab, the Clear Quran - Surah Qaf, ayah 5

Translation of Surah Qaf, ayah 5 (50:5)

بَلۡ كَذَّبُواْ بِٱلۡحَقِّ لَمَّا جَآءَهُمۡ فَهُمۡ فِيٓ أَمۡرٖ مَّرِيجٍ ٥
In fact, they reject the truth when it has come to them, so they are in a confused state.1 

Foot notes

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Meaning, they are confused about the Prophet (ﷺ): some say he is a poet, some say he is a fabricator, while others say he is insane. They also rejected the Quran as poetry, magic, or ancient fables.