Aleph was, once upon a time, a non-silent letter (some kind of glottal stop, but different from ayin). I have heard (although I couldn't give you a page citation) that the Talmud says somewhere that a cohen who can't pronounce the difference between לא and לו isn't allowed to bless the congregation.
(no subject)
Date: 2006-06-07 12:16 pm (UTC)