٣ـ مُحَمَّدُ بْنُ يَحْيَى رَفَعَهُ عَنْ أَبَانٍ قَالَ قُلْتُ لأَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) فَتَاةٌ مِنَّا بِهَا قَرْحَةٌ فِي فَرْجِهَا وَالدَّمُ سَائِلٌ لاَ تَدْرِي مِنْ دَمِ الْحَيْضِ أَوْ مِنْ دَمِ الْقَرْحَةِ فَقَالَ مُرْهَا فَلْتَسْتَلْقِ عَلَى ظَهْرِهَا ثُمَّ تَرْفَعُ رِجْلَيْهَا ثُمَّ تَسْتَدْخِلُ إِصْبَعَهَا الْوُسْطَى فَإِنْ خَرَجَ الدَّمُ مِنَ الْجَانِبِ الأيْمَنِ فَهُوَ مِنَ الْحَيْضِ وَإِنْ خَرَجَ مِنَ الْجَانِبِ الأيْسَرِ فَهُوَ مِنَ الْقَرْحَةِ. 
3. Muhammad ibn Yahya in a marfu‘ manner has narrated from Aban who has said the following: “I once said to abu ‘Abd Allah , a young woman of our people has a wound in her vagina. She finds bleeding but does not know if it is because of Hayd (menses) or because of the wound and blood flows. He (the Imam) said, ‘Instruct her to lie down on her back, raise her legs and place her middle finger inside. If blood comes from the right side, it is because of Hayd (menses); if it comes from the left side, it is because of the wound.’” 