Final answer:
The monks refuse to visit the dying man because they believe he is being punished by God for his sins. When they say 'Thy money perish with thee!', they mean that his wealth is worthless in the face of God's judgment.
Step-by-step explanation:
The monks refuse to visit the dying man because they believe that he is being punished by God for his sins and that it is not their place to interfere with God's will. They see his material wealth as a sign of his sinful life, and when they say 'Thy money perish with thee!', they are expressing their belief that his wealth is worthless in the face of God's judgment.