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It was narrated that az-Zubair bin al-`Awwam (رضي الله عنه) said: We used to pray Jumu’ah with the Prophet (ﷺ), then we would leave and seek the shade of the fortress, but we would not find any shade except (an area) the width of our feet.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا يَزِيدُ، أَنْبَأَنَا ابْنُ أَبِي ذِئْبٍ، عَنْ مُسْلِمِ بْنِ جُنْدُبٍ، عَنِ الزُّبَيْرِ بْنِ الْعَوَّامِ، رَضِيَ اللَّهُ عَنْهُ قَالَ كُنَّا نُصَلِّي مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْجُمُعَةَ ثُمَّ نَنْصَرِفُ فَنَبْتَدِرُ الْآجَامَ فَلَا نَجِدُ إِلَّا قَدْرَ مَوْضِعِ أَقْدَامِنَا قَالَ يَزِيدُ الْآجَامُ هِيَ الْآطَامُ.
sunnah.com