Both Adam and Eve sinned, but Adam was held responsible for their wrongdoing.
صَحِيحٌ أَنَّ آدَمَ وَحَوَّاءَ أَخْطَأَا كِلَاهُمَا ،‏ إِلَّا أَنَّ يَهْوَهَ حَمَّلَ آدَمَ ٱلْمَسْؤُولِيَّةَ عَنِ ٱلْخَطِيَّةِ .‏