The local administration made elaborate security arrangements outside Ansari's residence and the burial ground. Ansari died due to a cardiac arrest on Thursday.
The sources said Gahlot has been asked to appear for questioning in the case and get his statement recorded under the Prevention of Money Laundering Act (PMLA).
The ED has alleged that bribe money generated from corruption in a contract issued by the DJB was "passed on" as election funds to the ruling Aam Aadmi Party (AAP) in Delhi.