"The Messenger of Allah ﷺ set out at nightfall, then stopped to camp at the end of the night, and he did not wake up until the sun had risen or had partly risen. He did not pray until the sun had risen (fully), then he prayed, and that was the 'middle prayer' (Salat Al-Wusta)." (Using translation from Nasāʾī 625)  

«أَدْلَجَ رَسُولُ اللهِ ﷺ ثُمَّ عَرَّسَ فَلَمْ يَسْتَيْقِظْ حَتَّى طَلَعَتِ الشَّمْسُ أَوْ بَعْضُهَا فَلَمْ يُصَلِّ حَتَّى ارْتَفَعَتِ الشَّمْسُ فَصَلَّى وَهِيَ صَلَاةُ الْوُسْطَى»  

[Machine] It is Dhuhr prayer. Indeed, the Messenger of Allah ﷺ used to pray Dhuhr at the time of Hajirah, while the people were in their homes. So, there would be no one behind him except for the rows of Saf and Safan. Then Allah Almighty revealed, "And observe the prayers and the middle prayer" [Al-Baqarah 2:238]. Amr ibn Abi Hakim opposed him.  

هِيَ الظُّهْرُ إِنَّ رَسُولَ اللهِ ﷺ كَانَ يُصَلِّي الظُّهْرَ بِالْهَاجِرَةِ وَالنَّاسُ فِي قَائِلَتِهِمْ فَلَا يَكُونُ خَلْفَهُ إِلَّا الصَّفُّ وَالصَّفَّانِ فَأَنْزَلَ اللهُ تَعَالَى {حَافِظُوا عَلَى الصَّلَوَاتِ وَالصَّلَاةِ الْوُسْطَى} [البقرة 238] خَالَفَهُ عَمْرُو بْنُ أَبِي حَكِيمٍ  

The Messenger of Allah ﷺ used to offer the Zuhr prayer in midday heat; and no prayer was harder on the Companions of the Messenger of Allah ﷺ that this one. Hence the revelation came down: "Be guardians of your prayers, and of the midmost prayer" (2:238). He (the narrator) said: There are two prayers before it and two prayers after it. (Using translation from Abū Dāʾūd 411)  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي الظُّهْرَ بِالْهَاجِرَةِ وَلَمْ يَكُنْ يُصَلِّي صَلَاةً أَشَدَّ عَلَى أَصْحَابِ النَّبِيِّ ﷺ مِنْهَا فَنَزَلَتْ {حَافِظُوا عَلَى الصَّلَوَاتِ وَالصَّلَاةِ الْوُسْطَى} [البقرة 238] قَالَ إِنَّ قَبْلَهَا صَلَاتَيْنِ وَبَعْدَهَا صَلَاتَيْنِ  

[Machine] The Prophet ﷺ was occupied with something that caused him to miss the afternoon prayer until he prayed it between the evening prayers. He said, "Those who are preoccupied with the middle prayer, may Allah fill their houses and graves with fire."  

شَغَلُوا النَّبِيَّ ﷺ عَنْ صَلَاةِ الْعَصْرِ حَتَّى صَلَّاهَا بَيْنَ صَلَاتِي الْعِشَاءِ فَقَالَ «شَغَلُونَا عَنْ صَلَاةِ الْوُسْطَى مَلَأَ اللهُ بُيُوتَهُمْ وَقُبُورَهُمْ نَارًا»  

"They distracted us from Salatul-Wusta (the middle prayer) until the sun went down." (Using translation from Nasāʾī 473)  

عَنِ النَّبِيِّ ﷺ قَالَ «شَغَلُونَا عَنْ صَلَاةِ الْوُسْطَى حَتَّى غَرَبَتِ الشَّمْسُ»  

They distracted us on the day of al-Ahzab from ʿAsr prayer, until I heard the Messenger of Allah ﷺ say: ʿThey distracted us from the middle prayer, ‘Asr prayer. May Allah fill their graves and houses or stomachs with fire.” (Using translation from Aḥmad 1036)   

فَسَمِعْتُ النَّبِيَّ ﷺ يَقُولُ يَوْمَ الْأَحْزَابِ «شَغَلُونَا عَنْ صَلَاةِ الْوُسْطَى صَلَاةِ الْعَصْرِ مَلَأَ اللهُ قُبُورَهُمْ وَأَجْوَافَهُمْ نَارًا»