It's hardly a secret that Iran provides money, weapons, training, and direction to Hezbollah. E.g. as reported in Hezbollah Admits, “We Take Orders From Iran” | theTrumpet.com, 2007-04-27:
A Hezbollah official admitted on Iranian television that his organization receives approval for its terrorist attacks from spiritual leaders in Iran.
April 15, on Iranian TV station “al Qawthar,” the deputy secretary-general of Lebanon-based Hezbollah, Naim Kassem, revealed to an interviewer that Tehran’s ayatollahs must approve acts of violence including suicide bombings and rocket attacks. The admission provided frank public confirmation of a reality long understood in intelligence circles.
The religious doctrine which dictates Hezbollah’s actions in general
and those relating to the Jihad in particular, is based on the rulings
of the spiritual leader in Tehran. The spiritual leader has the power
to permit our actions, and the spiritual leader can forbid them. In
order to know what is permitted and forbidden regarding the Jihad, we
ask for and receive overall permission and only then do we carry out
the operation. Even with regard to the suicide bombings, no one is
allowed to kill himself without religious authorization. Even the
rocket attacks on Israel, against the civilian population [August
2006] … in order to apply pressure, even this required overall
Iranian television would hardly have played this interview without full Iranian government approval.
For those concerned that the above is taken from a religious-based magazine, the same information is available in the National Review, with the original English translation being an Israeli news release.
So you have three potentially biased news sources to choose from.