These two sons of Shemhazai, Hiwwa and Hiyya by name, dreamed dreams. The one saw a great stone which covered the earth, and the earth was marked all over with lines upon lines of writing. An angel came, and with a knife obliterated all the lines, leaving but four letters upon the stone. The other son saw a large pleasure grove planted with all sorts of trees. But angels approached bearing axes, and they felled the trees, sparing a single one with three of its branches.
When Hiwwa and Hiyya awoke, they repaired to their father, who interpreted the dreams for them, saying, "God will bring a deluge, and none will escape with his life, excepting only Noah and his sons." When they heard this, the two began to cry and scream, but their father consoled them: "Soft, soft! Do not grieve. As often as men cut or haul stones, or launch vessels, they shall invoke your names, Hiwwa! Hiyya!" This prophecy soothed them.