Iran's Supreme Leader Ali Khamenei led prayers on Thursday at the funeral of Sayyed Razi Mousavi, a senior Revolutionary Guards (IRGC) adviser killed in what Iran said was an Israeli air strike in Syria.
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State television said Khamenei paid tribute "to this martyr's tireless struggle and called for his companionship with the guardians of God."
Mousavi was one of the most experienced and effective commanders of the resistance front, said Major General Hossein Salami, chief commander of the Revolutionary Guards Corps (IRGC).
"Our revenge for the martyrdom of Sayyed Razi will be nothing less than the removal of the Zionist regime," Salami said in a televised funeral speech, adding that he had defended the Muslim nation for almost 33 years.
"I am hopeful that soon, God permitting, the great and honorable Palestinian fighters will wipe out the geographical and political name of this evil and fake regime," while mourners chanted "Death to America, Death to Israel."
Musavi's body was flown from Syria to the holy Shi'ite city of Najaf in Iraq on Wednesday before being taken for burial in Tehran.
An IDF spokesperson declined specific comment about Mousavi's death on Monday, but said it took whatever action was necessary to defend the country.
Since the eruption of war between Israel and Hamas on Oct. 7, Iran-backed groups have mounted operations against Israel, while others, including militias in Iraq, have attacked U.S. interests.
For years, Israel has carried out attacks against what it describes as Iran-linked targets in Syria, where Tehran's influence has grown since it backed President Bashar al-Assad in the civil war that erupted in 2011.