# the wages you kept back from the laborers who mowed your fields are crying out against you

"God can see that you kept back the wages you should have given to those who mowed your fields" 

# The cries of the harvesters have reached the ears of the Lord of hosts

"The Lord of hosts has heard the cries of the harvesters" 

# the ears of the Lord of hosts

God is spoken of as if he had ears as humans have.