Expositor's Bible Commentary (Nicoll)
Leviticus 8:6
THE WASHING WITH WATER
"And Moses brought Aaron and his sons, and washed them with water."
The consecration ceremonies consisted of four parts, namely, the Washing, the Investiture, the Anointing, and the Sacrifices. Of these, first in order was the Washing. We read that "Moses"-acting throughout, we must remember, as Mediator, representing God-"brought Aaron and his sons, and washed them with water." The meaning of this act is so evident as not to have been called in question. Washing ever signifies cleansing; the ceremonial cleansing of the body, therefore, in symbol ever represents the inward purification of the spirit.
Of this usage the Biblical illustrations are very numerous. Thus, the spiritual purification of Israel in the latter day is described Isaiah 4:4 by the same word as is used here, as a washing away of a the "filth of the daughters of Zion" by the Lord. So, again, in the New Testament, we read that Christ declared unto Nicodemus that in order to see the kingdom of God a man must be born again, "of water and the Spirit," and in the Epistle to Titus Titus 3:5 we read of a cleansing of the Church "with the washing (marg., laver) of water, by the Word," even the "washing of regeneration." The symbolism in this case, therefore, points to cleansing from the defilement of sin as a fundamental condition of priesthood. As regards our Lord indeed, such cleansing was no more needed for His high priesthood than was the sin offering for Himself; for in His holy incarnation, though He took our nature indeed with all the consequences and infirmities consequent on sin, He was yet "without sin." But all the more it was necessary in the symbolism that if Aaron was to typify the sinless Christ of God he must be cleansed with water, in type of the cleansing of human nature, without which no man can approach to God. And in that not only Aaron, but also his sons, the ordinary priests, were thus cleansed, we are in the ordinance significantly pointed to the deep spiritual truth that they who are called to be priests to God must be qualified for this office, first of all, by the cleansing of their human nature through the washing of regeneration, by the power of the Holy Ghost.