Is there a religious explanation for writing Biblical Hebrew without vowels?
"Was Hebrew originally written without vowels" does not address the reasons for not using vowels.
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Because when writing on stone, or very expensive animal parchment, you want to conserve as much space as possible.
Old Hebrew and Aramaic was also written without spaces between words. This is why Aramaic later developed "ending letters," so that way one could see when some words ended because of the final/ending letter.