Dr. Mustafa Khattab, the Clear Quran - 56:46

Translation for 56:46

وَكَانُواْ يُصِرُّونَ عَلَى ٱلۡحِنثِ ٱلۡعَظِيمِ ٤٦
and persisted in the worst of sin.1

Foot notes

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i.e., associating others with Allah in worship and denying the resurrection and judgment.