The line by John Ball, 14th-century English priest, is this:
"When Adam delved and Eve span,
Who was then the gentleman?"
It means that when the first people were digging in the earth
(delving) to grow their own food and spinning their own cloth,
where were the people of privilege (the gentlemen) who profited
from the labor of others while they lived at leisure? The implied
answer is: there were none. All were equal. All had to fend for
themselves. No one was higher than another, and no one got a free
ride.