Many people had threatened him in the past, but he always ignored them, Social activist Anna Hazare said.
Hazare had written to Prime Minister Narendra Modi on December 9, informing him that he would observe 'maun vrat' from December 20 as a "penance."
The ED has filed a money laundering case against Pawar, his nephew Ajit Pawar - a former deputy chief minister of Maharashtra - and others in connection with the scam.
According to doctors, there is 'nothing to worry' and they have advised the 82-year-old social activist to take complete rest.
Hazare said that the prime minister is afraid that once Lokpal becomes a reality his office, as well as that of his cabinet members, would also come under its purview.
Social activist Anna Hazare, who spearheaded nation-wide anti-graft protests in 2011, is again set to launch a 'satyagraha' in Delhi next month.
Hazare blamed the AAP's inability to act on its promises for its differences with the people.