https://telewebion.ir/episode/0x16baad1f

I don't know what you expect from a source, there's a very good chance that you don't know Farsi. The title of that video,

رهبر انقلاب به ملکوت اعلی پیوست

Roughly translates to "the leader of the revolution joined the great kingdom."

There aren't any articles from irib yet, but multiple sites say that irib confirmed it live on TV about half an hour ago: https://p.dw.com/p/59bSu

Al Mayadeen reported on it so it's extremely likely to be true

CGTN just reported it from the Fars newswire