TEHRAN — The brother of Iran’s president walked into Tehran’s only Jewish hospital on Thursday, delivering a surprise donation along with the message that the Health Ministry would give more attention to hospitals that traditionally serve Christian and Jewish Iranians.

“We are very happy,” a nurse there said by telephone. “This is a good sign.”

The hospital, the Dr. Sapir Hospital and Charity Center, received $400,000 from the government of President Hassan Rouhani, the semiofficial Mehr News Agency reported. Another Iranian source, the semiofficial website Tabnak, said that the amount was $200,000, but that a second installment in the same amount would be coming.

The leader’s brother, Hossein Fereydoon, who goes by Mr. Rouhani’s original family name, was quoted by Tabnak as saying, “Our government intends to unite all ethnic groups and religions, so we decided to assist you.”

Since taking office in August, Mr. Rouhani has embarked on a campaign to engage the world after years of isolation under his predecessor, Mahmoud Ahmadinejad, who never missed an opportunity to denigrate Israel and deny that six million Jews had died in the Holocaust.