Musnad Ahmad 1179
It was narrated that Abul-Wadi said:
I saw ‘Ali (رضي الله عنه) when he killed the people of an-Nahrawan. He said: Look for the deformed one. They looked for him among the slain and said: We cannot find him. He said: Go back and look again, for by Allah I did not lie and I was not told a lie. So they went back and looked for him. That happened several times, and each time he swore by Allah, saying: I did not lie and I was not told a lie. Then they went out and they found him beneath the slain, lying in the mud. They brought him out, and brought him [to ‘Ali]. Abul-Wadi said: It is as if I can see him: an Abyssinian with one arm ending in something like the breast of a woman, on which there are hairs like the hair on the tail of a jerboa.
حَدَّثَنَا عَبْد اللَّهِ، حَدَّثَنِي عُبَيْدُ اللَّهِ بْنُ عُمَرَ الْقَوَارِيرِيُّ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، حَدَّثَنَا جَمِيلُ بْنُ مُرَّةَ، عَنْ أَبِي الْوَضِيءِ، قَالَ شَهِدْتُ عَلِيًّا رَضِيَ اللَّهُ عَنْهُ حَيْثُ قَتَلَ أَهْلَ النَّهْرَوَانِ قَالَ الْتَمِسُوا إِلَيَّ الْمُخْدَجَ فَطَلَبُوهُ فِي الْقَتْلَى فَقَالُوا لَيْسَ نَجِدُهُ فَقَالَ ارْجِعُوا فَالْتَمِسُوا فَوَاللَّهِ مَا كَذَبْتُ وَلَا كُذِبْتُ فَرَجَعُوا فَطَلَبُوهُ فَرَدَّدَ ذَلِكَ مِرَارًا كُلُّ ذَلِكَ يَحْلِفُ بِاللَّهِ مَا كَذَبْتُ وَلَا كُذِبْتُ فَانْطَلَقُوا فَوَجَدُوهُ تَحْتَ الْقَتْلَى فِي طِينٍ فَاسْتَخْرَجُوهُ فَجِيءَ بِهِ فَقَالَ أَبُو الْوَضِيءِ فَكَأَنِّي أَنْظُرُ إِلَيْهِ حَبَشِيٌّ عَلَيْهِ ثَدْيٌ قَدْ طَبَقَ إِحْدَى يَدَيْهِ مِثْلُ ثَدْيِ الْمَرْأَةِ عَلَيْهَا شَعَرَاتٌ مِثْلُ شَعَرَاتٍ تَكُونُ عَلَى ذَنَبِ الْيَرْبُوعِ‏.‏