1. The origin of language

4. One of the oldest languages discovered in the middle east was Paleo hebrew. Paleo hebrew used pictograms. But, contrary to the Sumerian cuneiform alphabet and the Egyptian Hieroglyphs, which used pictograms just as ideograms, paleo hebrew gave a phonetic value to its pictograms. This way, this written language was much more powerful: with just 22 letters, an infinite number of words and concepts could be created.
Ancient Hebrew coin struck before the Babylonian captivity.

5. Siloam Inscription – Hezekiah’s tunnel – Jerusalem

6. Tel Dan Stele

7. The origin of this paleo hebrew alphabet was discovered by a famous modern archeologist, Flinders Petrie (an English Egyptologist), in the Sinai region. He found some steles with some « sinaitic » inscriptions that happened to be the origin of the Hebrew alphabet.

8. As the hebrews were divided into two kingdoms (the kingdom of Israel and the kingdom of Judah in 930bc) the paleo hebrew alphabet evolved in different ways. When the educated jews of the kingdom of Judah were exiled to Babylon, they changed the way they wrote their alphabet under the influence of the Aramic or chaldean alphabet that the Babylonians used, and started using the block letters that modern Hebrew still uses today.
The kingdom of Israel kept the original paleo hebrew alphabet and spread it to other regions as the 10 tribes of its kingdom were scattered. Depending on the direction the different people used to write, they wrote the letters reversed or not.
A summary of the evolution of paleo hebrew:

9. Nota Bene: The Samaritans who still live in Palestine nowadays still use this old Hebrew Alphabet to write their Torah.

10. Through the spread of the paleo hebrew alphabet through Europe (the phoenicians, the Greeks, the Romans….etc), we can follow the scattering of the 10 lost tribes of Israel and in particular of the Ephraimites.

12. Both Biblical and latter-day revelation indicate that at the beginning of the world the children of Adam communicated using the original human language, or Adamic tongue. These revelations also promise a Millennial restoration of this "pure and undefiled" language. Modern scientific research provides theoretical evidence for a common ancient language (PBS made a Nova documentary on that topic entitled “In Search of the First Language.”)

13. Elder Joseph Fielding Smith taught that:
"The first man was instructed by the best teacher man ever had, for he was taught of God, and spoke the language of the Most High, in which angels conversed. This language he taught to his children.“
Elder Bruce R. McConkie has written:
"This first language spoken by mortals was either the celestial tongue of the Gods or such adaptation of it as was necessary to meet the limitations of mortality; and Adam and his posterity had power to speak, read, and write it. In writing of the saints in the day of the first man, Moses says: 'And a book of remembrance was kept, in the language of Adam, for it was given unto as many as called upon God to write by the spirit of inspiration; And by them their children were taught to read and write, having a language which was pure and undefiled.' (Moses 6:5-6.) The beauty and power of this Adamic language is indicated by a statement made by Moroni to the Lord about the Brother of Jared (who spoke the original and pure language): 'Thou madest him that the things which he wrote were mighty even as thou art unto the overpowering of man to read them.'" (Ether 12:24.)
This original language continued on the earth until the tower of Babel. Brigham Young taught that except for the Jaredites the Lord then "caused the people to forget their own mother tongue, scatter[ing] them abroad upon the face of the whole earth,"
One of the blessings to be restored during the Millennium appears to be the Adamic language. Interpreting a prophesy of the Old Testament prophet Zephaniah, Elder Bruce R. McConkie has said: "During the millennium, it appears that men will again have power to speak and write the Adamic language. Of that day the Lord says he will 'turn to the people a pure language, that they may all call upon the name of the Lord, to serve him with one consent.' (Zeph. 3:9.)