The FIRs were registered at Patna and Jamui against Prasad for the remark which Election Commission found violative of Representation of People Act and IPC sections, Additional Chief Election Officer R Lakshamanan told reporters.
Senior Superintendent of Police Patna, Vikash Vaibhav told PTI that a case has been registered against Prasad with Sachivalaya police station.
He said Prasad has been booked on report by Executive Magistrate Rajiv Mohan Sahay on the "Narbhakshi" comment.
Another FIR has been registered at Sikandra police station in Jamui district for the comment by Prasad while addressing an election meeting on October 4, Lakshamanan told reporters in Patna.
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Station House Officer of Sachivalaya police station Amrendra Kumar Jha said the case has been registered against Prasad under IPC sections 171(C), 171(F) and 188.
Section 171(C) pertains to undue influence at elections, Section 171(F) to punishment for undue influence or personation at an election, while Section 188 relates to disobedience to order duly promulgated by public servant.
Prasad had on September 30 tweeted "A Narbhakshi and exiled should not teach good conduct to Bihar. First he should tell people about his own misdeeds and stringent sections levelled against him."