זוהר שמות — דף רכה ע”ב

Rabbi Abba, Rabbi Acha and Rabbi Yossi were walking from Tiberias to Tzipori and met Rabbi Elazar and Rabbi Hiyya. They discussed the secret of the silver and the Tabernacle: silver comes from judgment and gold from mercy, and they nourish each other. The cloud in this world is the secret link between heaven and earth. The Tabernacle is the lower chariot that receives from above, and the entire accounting of the Tabernacle was connected to the secret of the letters.