وَ رُوِيَ عَنْ أَبِي عَبْدِ اَللَّهِ اَلْمُؤْمِنِ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ: قُلْتُ لِأَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ اَلزِّنَا شَرٌّ أَوْ شُرْبُ اَلْخَمْرِ وَ كَيْفَ صَارَ فِي اَلْخَمْرِ ثَمَانِينَ وَ فِي اَلزِّنَا مِائَةً فَقَالَ "يَا إِسْحَاقُ اَلْحَدُّ وَاحِدٌ وَ لَكِنْ زِيدَ هَذَا لِتَضْيِيعِهِ اَلنُّطْفَةَ وَ لِوَضْعِهِ إِيَّاهَا فِي غَيْرِ مَوْضِعِهَا اَلَّذِي أَمَرَ اَللَّهُ عَزَّ وَ جَلَّ بِهِ".
It is narrated from Abu Abdullah Al-Mu'min through Ishaq ibn Ammar who said: I asked Abu Abdullah (a.s): "Is adultery worse or drinking wine? And why is the punishment for drinking wine eighty lashes, while for adultery it is one hundred?" Imam (a.s) replied: "O' Ishaq, the punishment is the same, but it was increased in the case of adultery because it involves wasting the seed and placing it in a place other than where Allah (swt), the Almighty and Majestic, has commanded."