[Rokke]

I thought ancient Hebrew had no vowels?

[Verginius Rufus]

Yes. Aleph is not a vowel, it's a glottal stop (a slight catch in the voice). Thus sayeth Webster's Dictionary. Of course the Greeks turned it into a vowel (alpha).

[IncredibleHulk]

They didn't write the vowels but they did speak them. The vowels are so regular that you can insert the vowels into the correct places almost all of the time. There are a few exceptions.