عَنْ سَعِيدِ بْنِ الْحَارِثِ الْأَنْصَارِيِّ عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ رَضِيَ اللَّهُ عَنْهُ قَالَ: كُنْتُ أُصَلِّي مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ الظُّهْرَ فَآخُذُ قَبْضَةً مِنْ حَصًى فِي كَفِّي لِتَبْرُدَ حَتَّى أَسْجُدَ عَلَيْهِ مِنْ شِدَّةِ الْحَرِّ (وَفِي رِوَايَةٍ) فَأَجْعَلُهَا فِي يَدِي الْأُخْرَى حَتَّى تَبْرُدَ مِنْ شِدَّةِ الْحَرِّ
It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him), he says: I used to perform the Zuhr prayer with the Messenger of Allah (peace and blessings be upon him), and due to the intensity of the heat, I would take a handful of pebbles in my palm so that they would cool down and then I could prostrate on them. In another narration it is stated: Due to the intensity of the heat, I would transfer them to the other hand so that they would cool down.