Imām Bukhārī narrates: Muhammad, that is Ibn Muqātil, narrated to us, he said: 'Abdullāh informed us, he said: Khālid ibn 'Abdur-Rahmān informed us, he said: Ghālib al-Qattān narrated to me, from Bakr ibn 'Abdullāh al-Muzanī, from Anas ibn Mālik, may Allāh be pleased with him, he narrated:
When we prayed the Zuhr prayer, mostly behind the Messenger of Allāh ﷺ, we would perform sajdah upon our garments, to protect ourselves from the heat.
حَدَّثَنَا مُحَمَّدٌ ـ يَعْنِي ابْنَ مُقَاتِلٍ ـ قَالَ أَخْبَرَنَا عَبْدُ اللَّهِ، قَالَ أَخْبَرَنَا خَالِدُ بْنُ عَبْدِ الرَّحْمَنِ، حَدَّثَنِي غَالِبٌ الْقَطَّانُ، عَنْ بَكْرِ بْنِ عَبْدِ اللَّهِ الْمُزَنِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كُنَّا إِذَا صَلَّيْنَا خَلْفَ رَسُولِ اللَّهِ صلى الله عليه وسلم بِالظَّهَائِرِ فَسَجَدْنَا عَلَى ثِيَابِنَا اتِّقَاءَ الْحَرِّ.
Reference: Sahih Al Bukhari 542