Former Law Minister Kapil Mishra on Wednesday sought to delink the AAP government's decision to divest him of the law department with his recommendation to register an FIR against former Delhi Chief Minister Shiela Dikshit.

Taking a dig at BJP for giving him a "honesty certificate", Mishra rubbished the Opposition's claims in this regard saying he had recommended a case against Dikshit in his capacity as Delhi Jal Board Chairman and Water Minister, posts that he continue to hold.

"Did you actually not understand that my recommendations (against Dikshit) were in my capacity as the DJB Chairman and Water Minister. I continue to hold those posts and working with greater vigour," Mishra said in a letter to BJP President Amit Shah.

Mishra also sought to clear air over reports of Chief Minister Arvind Kejriwal clipping his wings, saying he gets his "inspiration" to fight against graft from the latter.

"I have learnt from him (Kejriwal) to rest only after rooting out corruption completely. I am moving ahead with all his guidance," Mishra told PTI.

AAP justified the government's decision in handing over the law portfolio to Deputy Chief Minister Manish Sisodia saying the department needed an "experienced face" due to its "complicated" nature.

"It was a routine transfer. Kapil is most efficient and competent but law department is a bit complicated. There are legalities and technicalities and the government wanted someone experienced," AAP leader Ashutosh said.

In the letter, Mishra alleged that the "corrupt" are having a free run under the Narendra Modi-led dispensation and that it was coming in the way of AAP government's fight against graft.

"I would have felt happy had the BJP supported a single initiative of AAP in fighting graft...Have you ever wanted to know as to why Modiji is trying to make the Anti-Corruption Branch dysfunctional just when it had picked pace against corruption.

"Modiji had given big statements against UPA's scams but after the polls, it seems that he has started believing in Kapil Sibal's (Congress leader) zero loss theory," Mishra wrote.