مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ عَلِيِّ بْنِ أَحْمَدَ بْنِ أَشْيَمَ عَنْ بَعْضِ أَصْحَابِهِ قَالَ أَصَابَ رَجُلٌ غُلَامَيْنِ فِي بَطْنٍ فَهَنَّأَهُ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) ثُمَّ قَالَ أَيُّهُمَا الْأَكْبَرُ فَقَالَ الَّذِي خَرَجَ أَوَّلًا فَقَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) الَّذِي خَرَجَ آخِراً هُوَ أَكْبَرُ أَ مَا تَعْلَمُ أَنَّهَا حَمَلَتْ بِذَاكَ أَوَّلًا وَ إِنَّ هَذَا دَخَلَ عَلَى ذَاكَ فَلَمْ يُمْكِنْهُ أَنْ يَخْرُجَ حَتَّى خَرَجَ هَذَا فَالَّذِي يَخْرُجُ آخِراً هُوَ أَكْبَرُهُمَا .
8. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Ali ibn Ahmad ibn ‘Ushaym from certain persons of his people who has said the following: “Twin boys were born to a man and abu ‘Abd Allah , congratulated and asked him who is the older?’ He replied, ‘The one who came out first is the older one. Abu ‘Abd Allah , said, ‘No, the one who came out last is the older one because she conceived him first, and this one entered on him and he could not come out before he came out so the one who comes out last is the older one.’” 