I heard ‘Iyad al-Ashʿari say: i was present at al-Yarmouk and we had five commanders over us: Abu ʿUbaidah bin al-Jarrah, Yazeed bin Abi Sufyan, Ibn Hasanah, Khalid bin al-Waleed and ʿIyad - and this ʿIyad was not the one who narrated reports to Simak. - ʿUmar ؓ said: If fighting occurs, then your commander is Abu ʿUbaidah. So we wrote to him, saying: We are facing death; and we asked him for reinforcements. He wrote to us, saying: I have received your letter asking for reinforcements and I can tell you about who has the greatest support and the most ready troops. Allah, may He be glorified and exalted, ask Him for support, for Muhammad ﷺ was caused to prevail on the day of Badr with fewer than your numbers. When this letter of mine reaches you, fight them without referring back to me. So we fought them, and we defeated them, pursuing and killing them for four parasangs, and we acquired wealth (booly). They discussed the issue (of booty) and ‘Iyad suggested to us that we should give ten for every head. And Abu ʼUbaidah said: Who will compete with me (in a horse race)? A young man said: I will, if you donʿt get angry. Then he beat him, and I saw the two braids of Abu ‘Ubaidah flying as he raced behind him on an Arabian horse.

وَقَالَ عُمَرُ إِذَا كَانَ قِتَالٌ فَعَلَيْكُمْ أَبُو عُبَيْدَةَ قَالَ فَكَتَبْنَا إِلَيْهِ إِنَّهُ قَدْ جَاشَ إِلَيْنَا الْمَوْتُ وَاسْتَمْدَدْنَاهُ فَكَتَبَ إِلَيْنَا إِنَّهُ قَدْ جَاءَنِي كِتَابُكُمْ تَسْتَمِدُّونِي وَإِنِّي أَدُلُّكُمْ عَلَى مَنْ هُوَ أَعَزُّ نَصْرًا وَأَحْضَرُ جُنْدًا اللهُ ﷻ فَاسْتَنْصِرُوهُ فَإِنَّ مُحَمَّدًا ﷺ قَدْ نُصِرَ يَوْمَ بَدْرٍ فِي أَقَلَّ مِنْ عِدَّتِكُمْ فَإِذَا أَتَاكُمْ كِتَابِي هَذَا فَقَاتِلُوهُمْ وَلا تُرَاجِعُونِيقَالَ فَقَاتَلْنَاهُمْ فَهَزَمْنَاهُمْ وَقَتَلْنَاهُمْ أَرْبَعَ فَرَاسِخَ قَالَ وَأَصَبْنَا أَمْوَالًا فَتَشَاوَرُوا فَأَشَارَ عَلَيْنَا عِيَاضٌ أَنْ نُعْطِيَ عَنْ كُلِّ رَأْسٍ عَشْرَةًقَالَ وَقَالَ أَبُو عُبَيْدَةَ مَنْ يُرَاهِنِّي؟ فَقَالَ شَابٌّ أَنَا إِنْ لَمْ تَغْضَبْ قَالَ فَسَبَقَهُ فَرَأَيْتُ عَقِيصَتَيْ أَبِي عُبَيْدَةَ تَنْقُزَانِ وَهُوَ خَلْفَهُ عَلَى فَرَسٍ عَرَبِيٍّ

I heard ‘Iyad al-Ashʿari say: i was present at al-Yarmouk and we had five commanders over us: Abu ʿUbaidah bin al-Jarrah, Yazeed bin Abi Sufyan, Ibn Hasanah, Khalid bin al-Waleed and ʿIyad - and this ʿIyad was not the one who narrated reports to Simak. - ʿUmar ؓ said: If fighting occurs, then your commander is Abu ʿUbaidah. So we wrote to him, saying: We are facing death; and we asked him for reinforcements. He wrote to us, saying: I have received your letter asking for reinforcements and I can tell you about who has the greatest support and the most ready troops. Allah, may He be glorified and exalted, ask Him for support, for Muhammad ﷺ was caused to prevail on the day of Badr with fewer than your numbers. When this letter of mine reaches you, fight them without referring back to me. So we fought them, and we defeated them, pursuing and killing them for four parasangs, and we acquired wealth (booly). They discussed the issue (of booty) and ‘Iyad suggested to us that we should give ten for every head. And Abu ʼUbaidah said: Who will compete with me (in a horse race)? A young man said: I will, if you donʿt get angry. Then he beat him, and I saw the two braids of Abu ‘Ubaidah flying as he raced behind him on an Arabian horse. (Using translation from Aḥmad 344)

عُمَرُ رِضْوَانُ اللَّهِ عَلَيْهِ إِذَا كَانَ قِتَالٌ فَعَلَيْكُمْ أَبُو عُبَيْدَةَ قَالَ » فَكَتَبْنَا إِلَيْهِ أَنْ قَدْ جَاشَ إِلَيْنَا الْمَوْتُ وَاسْتَمْدَدْنَاهُ فَكَتَبَ إِلَيْنَا أَنَّهُ قَدْ جَاءَنِي كِتَابُكُمْ تَسْتَمِدُّونِي وَإِنِّي أَدُلُّكُمْ عَلَى مَا هُوَ أَعَزُّ نَصْرًا وَأَحْصَنُ جُنْدًا اللَّهُ فَاسْتَنْصِرُوهُ فَإِنَّ مُحَمَّدًا ﷺ قَدْ نُصِرَ بِأَقَلَّ مِنْ عَدَدِكُمْ فَإِذَا أَتَاكُمْ كِتَابِي فَقَاتِلُوهُمْ وَلَا تُرَاجِعُونِي قَالَ فَقَاتَلْنَاهُمْ فَهَزَمْنَاهُمْ وَقَتَلْنَاهُمْ أَرْبَعَ فَرَاسِخَ وَأَصَبْنَا أَمْوَالًا فَتَشَاوَرُوا فَأَشَارَ عَلَيْهِمْ عِيَاضٌ عَنْ كُلِّ رَأْسٍ عَشْرَةٌ وَقَالَ أَبُو عُبَيْدَةَ مَنْ يُرَاهِنُنِي؟ فَقَالَ شَابٌّ أَنَا إِنْ لَمْ تَغْضَبْ قَالَ «فَسَبَقَهُ فَرَأَيْتُ عَقِيصَتَيْ أَبِي عُبَيْدَةَ تَنْقُزَانِ وَهُوَ خَلْفَهُ عَلَى فَرَسٍ عَرَبِيٍّ»