Angels-BOOK OF JUBILEES

The Book of Jubilees is an apocryphal work composed during the
intertestamental period. According to this book, the angels were created
on the first day of Creation:
On the first day He created the heavens which are above and
the earth and the waters and all the spirits which serve before
Him—the angels of the presence, and the angels of sanctification,
and the angels of the spirits of the winds, and the angels
of the spirit of clouds, and of darkness. . . . (Giovetti, p. 19)
The Book of Jubilees also recounts the central angel tale of the
Book of Enoch, in which a group of angels mate with mortal females,
fall from grace and become devils after leaving their heavenly abode.
The Book adds that God sent the Flood to destroy the race of sinful
giants who were the offspring of these unnatural unions.