Numbers 19:2 - Matthew Poole's English Annotations on the Holy Bible

The ordinance of the law, or, the constitution of the law, i.e. that which God hath ordained or established by law. That they bring thee, at their common charge, because it was for the common good. Red; a fit colour to shadow forth both the bloody nature and complexion of sin, Isaiah 1:8, and the human nature, and especially the blood, of Christ, from which this water and all other rites had their purifying virtue. Wherein is no blemish; a fit type of Christ, who was such, Hebrews 7:26 1 Peter 1:19. Upon which never came yoke; whereby may be signified, either that Christ in himself was free from all the yoke or obligation of God's command, till for our sakes he took up our yoke, and put himself under the law; or that Christ was not drawn or forced to undertake our burden and cross, but that lie did voluntarily choose it. See 1 Thessalonians 10:17,18.