They are made to drink of a spring fiercely boiling.
Drinking from a flaming spring
that is fueled from a tremendously hot fountain
Made to drink from a boiling spring
Being given drink/being watered from (a) present/near water well/spring
Imagine what a torture it is to drink from boiling water of Hell
Made to drink water from the boiling hot spring
And will be made to drink from a boiling spring
(They will be) offered to drink (water) from a boiling spring
They shall be made to drink from a spring of boiling hot water
They will be given to drink from a boiling spring