they shall
Leviticus 8:34
As he hath done this day, so the LORD hath commanded to do, to make an atonement for you.
consecrate themselves
Exodus 29:24
And thou shalt put all in the hands of Aaron, and in the hands of his sons; and shalt wave them for a wave offering before the LORD.
Exodus 32:29
For Moses had said, Consecrate yourselves to day to the LORD, even every man upon his son, and upon his brother; that he may bestow upon you a blessing this day.