Numbers 19:2
A red heifer - Red, in order to shadow forth man' s earthly body, even as the name Adam bears allusion to the red earth of which man' s body was fashioned.
Without spot, wherein is no blemish - As with sin-offerings generally Leviticus 4:3.
Upon which never came yoke - So here and elsewhere (see the marginal references), in the case of female victims.
