The Apostle of Allah ﷺ used to offer the noon prayer when the sun declined.  

كَانَ النَّبِيُّ ﷺ يُصَلِّي الظُّهْرَ إِذَا دَحَضَتِ الشَّمْسُ  

We complained to the Messenger of Allah ﷺ (the difficulty of) saying prayer on the intensely heated (ground or sand), but he paid no heed to our complaint.  

شَكَوْنَا إِلَى رَسُولِ اللَّهِ ﷺ الصَّلاَةَ فِي الرَّمْضَاءِ فَلَمْ يُشْكِنَا  

We came to the Messenger of Allah ﷺ and we complained to the Messenger of Allah ﷺ about (saying prayer) on the extremely heated ground (or sand), but he paid no heed to us. Zuhair said: I asked Abu Ishaq whether it was about the noon prayer. He said: Yes. I again said whether it concerned the (offering) of the noon (prayer) in earlier hours. He said: Yes. I said: Did it concern expediting it? He said: Yes.  

أَتَيْنَا رَسُولَ اللَّهِ ﷺ فَشَكَوْنَا إِلَيْهِ حَرَّ الرَّمْضَاءِ فَلَمْ يُشْكِنَا قَالَ زُهَيْرٌ قُلْتُ لأَبِي إِسْحَاقَ أَفِي الظُّهْرِ قَالَ نَعَمْ قُلْتُ أَفِي تَعْجِيلِهَا قَالَ نَعَمْ  

We used to say (the noonprayer) with the Messenger of Allah ﷺ in the intense heat, but when someone amongst us found it hard to place his forehead on the ground, he spread his cloth and prostrated on it.  

كُنَّا نُصَلِّي مَعَ رَسُولِ اللَّهِ ﷺ فِي شِدَّةِ الْحَرِّ فَإِذَا لَمْ يَسْتَطِعْ أَحَدُنَا أَنْ يُمَكِّنَ جَبْهَتَهُ مِنَ الأَرْضِ بَسَطَ ثَوْبَهُ فَسَجَدَ عَلَيْهِ