On more than one occasion Israel has bombed Iran
When? There were a few mysterious explosions and assassinations but I don't recall anything other than that.. Syria on the other hand was bombed, as was Iraq.
What I have not seen in this time is Iran retaliate, start a war, or massacre their allegedly sworn enemies.
Then you've been looking the wrong way - Iran has for a long time waged war through its proxies, Hezbollah for example being the main Iranian weapon which it has used many times to bomb Israel and Israeli/Jewish civilians around the world on numerous occasions. There is nothing innocent about Iran, they have plenty of blood on their hands and the extreme islamist regime there is plenty evil without any help from the west.
As for this allegedly intercepted message.. I don't know how true it is but it certainly does not surprise me since for a start it follows their usual method of getting their proxies to do the dirty work and secondly, perhaps more importantly - Iran and Syria have a number of widely publicised mutual self-defence pacts for just such a situation so Iran is now obligated to join the fight with Syria if/when the US attacks.