Khamenei attacked the Arab countries that took part in the international force against the Houthis, "this is treason", a senior Iranian general threatened a naval blockade in the Mediterranean.
Iranian officials have repeatedly threatened to expand the conflict to additional fronts through their proxies in recent weeks.
Iran does not recognize Israel's existence, while Israel has long threatened military action against Iran if diplomacy fails to curb its disputed nuclear activity.
The meeting in Tehran is designed to show that Hamas has the total support of Iran.
Iran's Khamenei has taken to social media in the past to attack Israel, the United States, and other parties Iran sees as adversarial.
Iran has long backed the Hamas group, which controls the Gaza Strip and rejects Israel's right to exist.
"The Zionist regime is dying," said Iran's Ayatollah Ali Khamenei in a post on X.
In a speech by Iran’s Supreme Leader, Ayatollah Ali Khamenei, he claimed any countries that would normalize with Israel were “betting on a losing horse.”
Israel and the US have repeatedly called for their allies to join in their recognition of the IRGC as a terrorist entity, though many countries remain hesitant to do so.
Former US national security advisor John Bolton and Israel's Intelligence Minister Gila Gamliel discussed what happens in Iran when Khemenei dies.