100-160 CE: Rav Shimon bar Yochai was chosen to reveal the Zohar. He and Rav Elazar, his son, hid in the ground, in a cave for 13 years. Rav Abba concealed the wisdom in writing the physical book of the Zohar.
Sefer HaBahir PDF R. Nehunya, a rabbi of the Mishnaic era, who lived around 100 CE. Medieval Kabbalists write that the Bahir did not come down to them as a unified book, but rather in pieces found in scattered scrolls and booklets. The scattered and fragmentary nature of the Bahir''s text, which sometimes ends discussion in mid-sentence, and which often jumps randomly from topic to topic, supports this claim.