This is the ordinance of the law. חֻקַּת הַתּוֹרָה. Law-statute: an unusual combination only found elsewhere in Numbers 31:21, which also concerns legal purifications. A red heifer. This offering was obviously intended, apart from its symbolic significance, to be studiedly simple and cheap.
In contradiction to the many and costly and ever-repeated sacrifices of the Sinaitic legislation, this was a single individual, a female, and of the most common description: red is the most ordinary colour of cattle, and a young heifer is of less value than any other beast of its kind.
The ingenuity indeed of the Jews heaped around the choice of this animal a multitude of precise requirements, and supplemented the prescribed ritual with many ceremonies, some of which are incorporated by the Targums with the sacred text; but even so they could not destroy the remarkable contrast between the simplicity of this offering and the elaborate complexity of those ordained at Sinai.
Only six red heifers are said to have been needed during the whole of Jewish history, so far-reaching and so long-enduring were the uses and advantages of a single immolation. It is evident that this ordinance had for its distinguishing character oneness as opposed to multiplicity, simplicity contrasted with elaborateness.
Without spot, wherein is no blemish. See on Le Numbers 4:8. However little, comparatively speaking, the victim might cost them, it must yet be perfect of its kind. The later Jews held that three white hairs together on any part of the body made it unfit for the purpose.
On the sex and color of the offering see below. Upon which never came yoke. Cf. Deuteronomy 21:3; 1 Samuel 6:7. The imposition of the yoke, according to the common sentiment of all nations, was a species of degradation, and therefore inconsistent with the ideal of what was fit to be offered in rids ease.
That the matter was wholly one of sentiment is nothing to the point: God doth not care for oxen of any kind, but he doth care that man should give him what is, whether in fact or in fancy, the best of its sort.