559. hadíth
وَ رُوِيَ فِي خَبَرٍ آخَرَ: "أَنَّهُ يُطْعَمُ اَلسَّمَكَ اَلطَّرِيَّ ثَلاَثَةَ أَيَّامٍ ثُمَّ يُقَالُ لَهُ بُلْ عَلَى اَلرَّمَادِ فَإِنْ ثَقَبَ بَوْلُهُ اَلرَّمَادَ فَلَيْسَ بِعِنِّينٍ وَ إِنْ لَمْ يَثْقُبْ بَوْلُهُ اَلرَّمَادَ فَهُوَ عِنِّينٌ".
In another narration, it is reported: "The man is to be fed fresh fish for three days, and then he is instructed to urinate on ashes. If his urine penetrates through the ashes, he is not impotent. However, if his urine does not penetrate the ashes, then he is indeed impotent."