21 It shall be a perpetual statute to them. He who sprinkles the water for impurity shall wash his clothes, and he who touches the water for impurity shall be unclean until evening.
Numbers 19:21 Cross References - WEB
Leviticus 11:25
25 Whoever carries any part of their carcass shall wash his clothes, and be unclean until the evening.
Leviticus 11:40
40 He who eats of its carcass shall wash his clothes, and be unclean until the evening. He also who carries its carcass shall wash his clothes, and be unclean until the evening.
Leviticus 16:26-28
26 “He who lets the goat go as the scapegoat shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp.
27 The bull for the sin offering, and the goat for the sin offering, whose blood was brought in to make atonement in the Holy Place, shall be carried outside the camp; and they shall burn their skins, their flesh, and their dung with fire.
28 He who burns them shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp.
Hebrews 7:19
19 (for the law made nothing perfect), and a bringing in of a better hope, through which we draw near to God.
Hebrews 9:10
10 being only (with meats and drinks and various washings) fleshly ordinances, imposed until a time of reformation.
Hebrews 9:13-14
13 For if the blood of goats and bulls, and the ashes of a heifer sprinkling those who have been defiled, sanctify to the cleanness of the flesh,
14 how much more will the blood of Christ, who through the eternal Spirit offered himself without defect to God, cleanse your conscience from dead works to serve the living God?
Hebrews 10:4
4 For it is impossible that the blood of bulls and goats should take away sins.