זוהר שמות — דף פ ע”ב

This folio reveals that the Holy One, Blessed be He, hid wisdom in the plants of the earth so that people would not stray from His ways. For this reason, the wisdom of herbs was revealed to one who could see evil spirits in the form of a two-headed man. The herbalist story continues: through the herb sheltered under vine leaves, Rabbi Yossi and his son were healed from a spiritual harm. The herb used to expel an evil spirit through the chimney reveals the divine power hidden within creation.