... a ploughman was ploughing an area within the nearby graveyard, and was advised not to continue as it was holy ground. He responded by saying ‘St. Mobhí or St. Mobhó, I’ll plough my frough before I go’, at which point the ground opened up and swallowed him, with his horses and plough.
from: Ancient & Holy Wells of Dublin
by Gary Branigan
published by The History Press Ireland