And that was your assumption which you assumed about your Lord. It has brought you to ruin, and you have become among the losers."
The Saheeh International Quran Translation
وَذَٰلِكُمْ ظَنُّكُمُ ٱلَّذِى ظَنَنتُم بِرَبِّكُمْ أَرْدَىٰكُمْ فَأَصْبَحْتُم مِّنَ ٱلْخَٰسِرِينَAnd that was your assumption which you assumed about your Lord. It has brought you to ruin, and you have become among the losers."