The Messenger of Allah (sal Allahu alaihi wa sallam) said: "The people
will sweat on the Day of Resurrection until their sweat penetrates
seventy cubits into the earth, then it will come up to their ears."
[Bukhari]
People's sweat will flow until it drenches the earth, then it will
start to rise until it reaches a height that will vary according to
their actions. For some, their sweat will reach their ankles, for
others it will reach their knees, or their waists, and for some it
will reach their mouths, like reins.
O Allah! Grant us shade under Your Throne that day, when there will be
no other shade.