Exodus 8:26

We shall sacrifice the abomination of the Egyptians - That is, The animals which they hold sacred, and will not permit to be slain, are those which our customs require us to sacrifice to our God; and should we do this in Egypt the people would rise in a mass, and stone us to death. Perhaps few people were more superstitious than the Egyptians. Almost every production of nature was an object of their religious worship: the sun, moon, planets, stars, the river Nile, animals of all sorts, from the human being to the monkey, dog, cat, and ibis, and even the onions and leeks which grew in their gardens. Jupiter was adored by them under the form of a ram, Apollo under the form of a crow, Bacchus under that of a goat, and Juno under that of a heifer. The reason why the Egyptians worshipped those animals is given by Eusebius, viz., that when the giants made war on the gods, they were obliged to take refuge in Egypt, and assume the shapes or disguise themselves under different kinds of animals in order to escape. Jupiter hid himself in the body of a ram, Apollo in that of a crow, Bacchus in a goat, Diana in a cat, Juno in a white heifer, Venus in a fish, and Mercury in the bird ibis; all which are summoned up by Ovid in the following lines: -

Duxque gregis fit Jupiter -

Delius in corvo, proles Semeleia capro,

Fele soror Phoebi, nivea Saturnia vacca,

Pisce Venus latuit, Cyllenius ibidis alis