Yadav can be seen threatening to indulge in violence at the marriage venue.
Reacting to it, Modi said: "He seems to be frustrated ... I have been exposing corruption and scandals involving his family which led to his party losing power and he lost the minister's chair."
"However, I am worried his provocative speech may lead to some untoward incident on the day of the wedding. I would request Lalu to intervene and restrain his son," he said.
Modi has levelled a number of allegations against Prasad's family acquiring benami properties.
The RJD has trashed all the allegations and accused the senior BJP leader of suffering from "Lalu phobia".
Utkarsh's wedding is expected to be a simple affair. Guests have been requested not to bring gifts and they are not likely to be served lavish meals. There would be no music bands or DJs.
Invitation cards have been distributed through WhatsApp and email.
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