ENOfficial
It was narrated that Anas bin Malik said: “We used to perform prayer with the Prophet (ﷺ) when it was very hot. When one of us could not place his forehead firmly on the ground, he would spread his garment and prostrate on it.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ بْنِ حَبِيبٍ، حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، عَنْ غَالِبٍ الْقَطَّانِ، عَنْ بَكْرِ بْنِ عَبْدِ اللَّهِ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كُنَّا نُصَلِّي مَعَ النَّبِيِّ ـ صلى الله عليه وسلم ـ فِي شِدَّةِ الْحَرِّ فَإِذَا لَمْ يَقْدِرْ أَحَدُنَا أَنْ يُمَكِّنَ جَبْهَتَهُ بَسَطَ ثَوْبَهُ فَسَجَدَ عَلَيْهِ .
sunnah.com