ANSWER: In the Old Testament the law embraces not only moral actions, such as are right or wrong as discoverable by conscience, or revealed in the Decalogue, but also acts violating the code of ceremonial purity, and acts forbidden by the Judicial law which relates solely to the Jewish nation. These three kinds of laws are intermingled in the Pentateuch. The Jew regards all of them as morally obligatory. Hence he regards the breeding of mules as sinful because it is forbidden by the ceremonial law, which the Christian is under no obligation to keep, because Christ abrogated it in Mark 7:19, "This he said making all meats clean," R. V. The Jewish farmer deems it wicked to put a pumpkin seed in a hill of corn, or to wear a linsey woolsey garment, or one made of cotton and wool, sometimes called crugget, a comfortable clothing within reach of the poor. The highest magnifying glass fails to find any moral element in Lev. 19:19. Hence the mule is not an outlaw, nor is his breeder a sinner.
— Steele's Answers pp. 234, 235.