Let's get real here, they already have numerous times, inflicting terrible losses on the Egyptians and the Jordanians. They would be especially capable with all their technology that they are designing and revolutionizing.
6 day war, need I say more
Surprising it looks like the Arab sates have more power. Despite this Israel is small and easy to defend and it has lots of war experience. Also looking at history Israel always wins.
Israel is more awesome. With the power of their awesomeness they always win. Of course their military experience and technology help with the awesomeness meter.
This very scenario happened in the 1948 Arab–Israeli War and guess who won. Arab states also tried and failed to destroy Israel in the Six-Day War and the Yom Kippur War but failed and even lost territory. Israel also has Nukes, so...
Israel has the United States as an ally.
Israel's done it before.
As long as the United States kept supporting them, yes, they could withstand the might of the Arab nations, and even Iran.
Iran is enough to ruin Israel. Never compare Iran with other Middle-East countries. However, Iranians are mainly Shia-Muslims and Shia-Muslims are all prohibited from attacking another nation. So if you wanna try Iranian army's power Israel should attack first. Iran's missiles will reach there in less than 7 min.
Only if the US stopped fighting for Israel. The Arabs have a huge advantage in numbers. Iran isn't an Arab state, but it could offer a decent challenge to Israel by itself. The Saudis and Egyptians have strong militaries, too. Of course, this won't happen because the US bends over backwards to put Israel's interests first.
If it were truly an all-out war with all Arab states participating, Israel would simply not be able to withstand the sheer numbers. Israel itself knows this and tries very hard to keep this from happening. Many people point to the six-day war, and indeed, in a short conflict where the Arab states are not particularly committed, Israel could win by making the affair costly for the Arabs. But I interpret the question as meaning the Arab states are deeply committed and are willing to use insurgencies, and all their combined might and wealth.