Sunan an-Nasa'i 1081

Qutaibah informed us: ʿAbbad narrated to us, from Muhammad ibn ʿAmr, from Saʿid ibn al-Harith, from Jabir ibn ʿAbdullah, who said: We used to pray Zuhr with the Messenger of Allah (ﷺ). I would take a handful of pebbles in my palm to cool them, then transfer them to my other palm. When I prostrated, I would place them down and rest my forehead on them.