“The World’s Oldest Alphabet”, by Douglas Petrovich, purports to decipher graffiti on rocks at the Sinai mines. Many of these are apparently in Hebrew
(Google “Sinai Inscriptions”, and then choose “images”, to see them).
Many of these mention biblical figures, and there is even one that translates (roughly) as, “We’re still slaves, but Moses had startled Egypt”.
Yes, the old “proto-Hebraic” inscriptions that were discovered by William Flinders Petrie. They are quite handy to bring up when people try to tell you that the Bible was written by illiterate sheep herders who passed it down through “oral tradition”, since they prove that the Hebrews had an alphabet and written language before they even left Egypt.