וַֽתַּעְגְּבָ֔ה עַ֖ל פִּֽלַגְשֵׁיהֶ֑ם אֲשֶׁ֤ר בְּשַׂר־חֲמוֹרִים֙ בְּשָׂרָ֔ם וְזִרְמַ֥ת סוּסִ֖ים זִרְמָתָֽם׃
And she doted upon concubinage with them, whose flesh is as the flesh of asses, and whose issue is like the issue of horses.
Read Jewish philosophical commentary on Ezekiel 23:20: and classical philosophical sources.