"In my 43-year-long political journey, I have never made a remark that might have sounded petty... I also advise my party men to avoid responding in kind when our adversaries say anything inappropriate," Kumar told reporters on the sidelines of a weekly public interaction programme.
Kumar was responding to queries about a slanging match that had erupted between the RJD and the JD(U) last week when their leaders released pictures and issued statements questioning the character of top leaders of the rival side.
Tejaswi Yadav, younger son of Lalu Prasad, had said the picture predated his entry into politics.
"It was clicked during my cricketing days... perhaps at a party during an IPL match. I wonder what is so objectionable about the photograph and what is the JD(U) trying to prove," he had said.
The JD(U) had made the photograph public a couple of days after the RJD released a picture of one Rakesh Singh, named in an old hooch case, with Kumar.
On the opposition's relentless attacks on his government over the Srijan scam and the toilet scam, the chief minister said: "We deserve appreciation ... These scams were unearthed by our government, our officials and not by some political loudmouths."
Rebutting allegations by RJD leaders that post- prohibition liquor was being home delivered in Bihar, Kumar said: "People, especially in rural areas, are tipping off the police and bootleggers are being nabbed."
"We are undeterred ... in carrying forward our drives against social evils," the chief minister said.
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