Addressing an election rally here, he questioned SP chief Akhilesh Yadav as to how he could form a coalition with "those who tried to murder" his father.
He said Akhilesh lacks experience and hence does not know, unlike his father, how "cunning Congress people are".
Mocking at the alliance between SP and Congress, Modi likened it to a movie in which rivals befriend each other after the "interval".
"I want to ask how Akhilesh forgot the attack carried out on Mulayam Yadav by Congress in 1984... What can be more shameful than befriending those who tried to murder one's father?... They cannot be pardoned," the Prime Minister said.
Also Read
Recalling the incident, Modi said, "Fed up of attacks by Mulayam Singh as Leader of the Opposition in Vidhan Parishad, Congress got shots fired at him on March 4, 1984 but he scraped through...I want to tell Akhilesh that he should have remembered this incident before sitting in the lap of Congress."
On March 4, 1984, Mulayam Singh's car was fired at by some persons while he was on his way from Etawah to Lucknow and the name of a strong Congress leader had figured in the case.
Mocking at the SP-Congress alliance, Modi said, "A film is being played on the political stage of Uttar Pradesh in which the opponents, who had attacked each other with slogans such as '27 saal UP behal' and taken out yatras in the first half, have turned friends after interval and have embraced each other."
Reaching out to voters here in Kannauj which falls in the Lok Sabha constituency represented by Akhilesh's wife Dimple Yadav, Modi said, "SP-Cong tie up will shatter your dreams.
Disclaimer: No Business Standard Journalist was involved in creation of this content