Musnad Ahmad 3/360: Sad Bin Muadh (rta) & Squeezing Of The Grave
Please watch : Part-1 https://youtu.be/EWCNG6KXX78?si=P_3ItYW07Dmr-sIf
To understand the concept of punishment inside the grave , please refer to the following video : https://youtu.be/To2ySf8_G04?si=yML9PtGJgrxKJUnN