Sunan Ibn Majah
1033
Sahih+3

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.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi