# If a fire breaks out and spreads in thorns

"If someone starts a fire and it spreads in thorns"

# spreads in thorns

"moves along the ground through dry plants"

# stacked grain

"bundled grain" or "harvested grain"

# standing grain

This is grain that has not been cut, but it is ready to be harvested.

# a field is consumed

"fire consumes a field" or "fire destroys a field"

# must surely make restitution

"must certainly pay for the grain that the fire destroyed"