Upon the death of Adam, the holy book disappeared, but later the cave in which it was hidden was revealed to Enoch in a dream. It was from this book that Enoch drew his knowledge of nature, of the earth and of the heavens, and he became so wise through it that his wisdom exceeded the wisdom of Adam. Once he had committed it to memory, Enoch hid the book again.
Now, when God resolved upon bringing the flood on the earth, He sent the archangel Raphael to Noah, as the bearer of the following message: "I give thee herewith the holy book, that all the secrets and mysteries written therein may be made manifest unto thee, and that thou mayest know how to fulfil its injunction in holiness, purity, modesty, and humbleness. Thou wilt learn from it how to build an ark of the wood of the gopher tree, wherein thou, and thy sons, and thy wife shall find protection."