Cross reference
Psalms 129:3
3 The ploughmen were ploughing on my back; long were the wounds they made.
Isaiah 51:23
23 And I will put it into the hand of your cruel masters, and of those whose yoke has been hard on you; who have said to your soul, Down on your face! so that we may go over you: and you have given your backs like the earth, even like the street, for them to go over.
Psalms 141:7
7 Our bones are broken up at the mouth of the underworld, as the earth is broken by the plough.