Old English verb forms such as "hath" and "doth" are, I believe, normally pronounced with the /θ/ sound as in the word "think."
But somebody once told me that that is actually a mistake. The words, said he, were originally pronounced as present-day "has" and "does" with a /z/ sound. Pronouncing "hath" as /haθ/ rather than /haz/ is a modern mistake, said my source.
Is this true?