[Machine] The Prophet ﷺ used to pray with the Hajir or Hijra prayer, and it was the heaviest prayer on his companions. Then the verse was revealed: "Guard strictly (five obligatory) prayers, especially the middle prayer" [Quran 2:238]. He said: because before it and after it are two prayers, and likewise.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي بِالْهَجِيرِ أَوْ بِالْهَاجِرَةِ وَكَانَتْ أَثْقَلَ الصَّلَاةِ عَلَى أَصْحَابِهِ فَنَزَلَتْ {حَافِظُوا عَلَى الصَّلَوَاتِ وَالصَّلَاةِ الْوُسْطَى وَقُومُوا لِلَّهِ قَانِتِينَ} [البقرة 238] قَالَ لِأَنَّ قَبْلَهَا صَلَاتَيْنِ وَبَعْدَهَا صَلَاتَيْنِ وَكَذَلِكَ  

[Machine] He used to perform the Dhuhr prayer at the time of Haghir, and this was narrated by someone other than Abu Dawood. He added to it and said, meaning Zaidan, that it is the Dhuhr prayer. So they sent to Usamah and it was narrated by someone other than Ibn Abi Dhi'b from Az-Zubrahan bin Amr bin Umayyah Ad-Damri from Zaid bin Thabit, and Usamah narrated something similar to it.  

هِيَ الظُّهْرُ كَانَ رَسُولُ اللهِ ﷺ يُصَلِّيهَا بِالْهَجِيرِ وَرَوَاهُ غَيْرُهُ عَنْ أَبِي دَاوُدَ فَزَادَ فِيهِ فَقَالَ يَعْنِي زَيْدًا هِيَ الظُّهْرُ فَأَرْسَلُوا إِلَى أُسَامَةَ وَرَوَاهُ غَيْرُهُ عَنِ ابْنِ أَبِي ذِئْبٍ عَنِ الزِّبْرِقَانِ بْنِ عَمْرِو بْنِ أُمَيَّةَ الضَّمْرِيِّ عَنْ زَيْدِ بْنِ ثَابِتٍ وَأُسَامَةَ نَحْوَهُ  

[Machine] I heard Abu Sa'id Al-Khudri saying, "The middle prayer is the Dhuhr prayer." He said, "Then Ibn Umar passed by us and Urwah said, 'Send to Ibn Umar and ask him.' So, we sent a boy to him and he asked him. Then the messenger came and he said, 'It is the Dhuhr prayer.' So, we doubted the statement of the young boy and we all went to Ibn Umar and asked him, and he said, 'It is the Dhuhr prayer.'"  

سَمِعْتُ أَبَا سَعِيدٍ الْخُدْرِيِّ يَقُولُ صَلَاةُ الْوُسْطَى هِيَ صَلَاةُ الظُّهْرِ قَالَ فَمَرَّ عَلَيْنَا ابْنُ عُمَرَ فَقَالَ عُرْوَةُ أَرْسِلُوا إِلَى ابْنِ عُمَرَ فَسَلُوهُ فَأَرْسَلْنَا إِلَيْهِ غُلَامًا فَسَأَلَهُ ثُمَّ جَاءَ الرَّسُولُ فَقَالَ هِيَ صَلَاةُ الظُّهْرِ فَشَكَكْنَا فِي قَوْلِ الْغُلَامِ فَقُمْنَا جَمِيعًا فَذَهَبْنَا إِلَى ابْنِ عُمَرَ فَسَأَلْنَاهُ فَقَالَ هِيَ الظُّهْرُ  

[Machine] "He said, 'The middle prayer is the prayer of Dhuhr.'"  

أَنَّهُ قَالَ الصَّلَاةُ الْوُسْطَى صَلَاةُ الظُّهْرِ