Tertullian

“ Suppose that our God, then, be an asinine person, will you at all events deny that you possess the same characteristics with ourselves in that matter? (Not their heads only, but) entire asses, are, to be sure, objects of adoration to you, along with their tutelar Epona; and all herds, and cattle, and beasts you consecrate, and their stables into the bargain! ”

“ Chapter XI. [1] —The Absurd Cavil of the Ass’s Head Disposed of.
In this matter we are (said to be) guilty not merely of forsaking the religion of the community, but of introducing a monstrous superstition; for some among you have dreamed that our god is an ass’s head,—an absurdity which Cornelius Tacitus first suggested. In the fourth book of his histories, [2] where he is treating of the Jewish war, he begins his description with the origin of that nation, and gives his own views respecting both the origin and the name of their religion. ”