Patna, May 13 (IANS) Unwilling to forgive Bharatiya Janata Party (BJP) president Nitin Gadkari for his offensive remarks, Rashtriya Janata Dal (RJD) chief Lalu Prasad said Thursday that he doesn't believe in apologies and would teach the opposition leader a lesson in decency.

"Gadkari needlessly used shameful words. Called us dogs who lick feet. Previous BJP chiefs, including L.K. Advani, would have never used such shameful words even as they severely criticised us. We are taking it seriously," an unforgiving Lalu Prasad told reporters here.

Gadkari stirred a controversy at a rally in Chandigarh Wednesday when he accused Lalu Prasad and Samajwadi Party (SP) chief Mulayam Singh Yadav of betraying the opposition on recent cut motions against the government in parliament.

"Bade dakarte the sher jaise, aur kutte ke jaise ban kar Sonia-ji aur Congress ke ghar par talve chatne lage (these leaders were roaring like lions but later like dogs licked the feet of Sonia and the Congress)," Gadkari said.

He retracted the words soon after and Thursday also told reporters that he regretted his remarks and had respect for Lalu Prasad and Mulayam Singh.

"We don't believe in apologies and words being taken back. We will teach him a lesson in decency. We too have phrases but we won't use them," Lalu Prasad said.