Hebrew, at least as far as instances of Hebrew writing, is _much_ older than Arabic. There are 3,000 year old Hebrew Inscriptions ( see https://en.wikipedia.org/wiki/Zayit_Stone ). The Zayit stone was found 31 miles south west of Jerusalem and its dated as 10th century BCE.
Also see: https://www.quora.com/Which-language-is-older-Hebrew-or-Arab...