﴿ ٱنظُرْ كَيْفَ يَفْتَرُونَ عَلَى ٱللَّهِ ٱلْكَذِبَ ۖ وَكَفَىٰ بِهِۦٓ إِثْمًۭا مُّبِينًا ﴾

“Behold how they attribute their own lying inventions to God - than which there is no sin more obvious.”

(See) O Muhammad, (how they invent lies about Allah!) by saying: the sins that we commit during the day will be forgiven at night, and the sins we commit during the night will be forgiven in the day. (That of itself is flagrant sin) a clear lie about Allah.