Iran, whose leadership had issued a religious edict calling for Salman Rushdie’s murder more than three decades ago, has not officially commented on the attack against the author.

But supporters of the government took to social media to praise the stabbing of Mr. Rushdie as the ayatollah’s fatwa finally materializing in action. Some said they wished for him to die. Some warned that a similar fate awaits other enemies of the Islamic Republic.

A quote from Ayatollah Ali Khamenei, the current Iranian leader, was widely shared on social media in which he said the fatwa against Mr. Rushdie was “fired like a bullet that won’t rest until it hits its target.”

“This deserves congratulation: God willing, we will celebrate Salman Rushdie going to hell soon,” Keyvan Saedy, a conservative Iranian pundit, said on Twitter.

Hossein Saremi, a conservative social media activist, wrote on Twitter that the attacker was part of “Islam’s soldiers without borders.”

“Revenge may be delayed, but it will inevitably happen,” Mr. Saremi wrote.

Several accounts affiliated with the Revolutionary Guards on the application Telegram also openly boasted about the attack. One called Syria News published a post saying: “The order was carried out at a place they never thought about. It’s not important if he doesn’t die; it’s important that they understand the battle is not over.”

The Iranian news media referred to Mr. Rushdie as “blasphemous” and an “infidel,” and carried updates with news about his condition, citing Western outlets.

A conservative news website, Eghtesad Salem, published a column saying that the attack on Mr. Rushdie in New York carried a clear message to American officials: that they, too, would be hunted down for the assassination of Iran’s top general, Qassim Suleimani, who died in a U.S. airstrike in January 2020. The column mentioned former President Donald J. Trump and his former secretary of state, Michael Pompeo.

“Carrying out the order to murder Salman Rushdie 33 years after it was issued sends a message to American officials that they must fear Iran’s revenge for Gen. Qassim Suleimani, until their death, even if the revenge takes 33 years,” wrote Majid Motamedi.

A senior adviser to Iran’s nuclear negotiating team, Seyed Mohammad Marandi, wrote on Twitter that he will not shed tears for a writer “who spouts endless hatred and contempt for Muslims and Islam.”