17 The priest shall take holy water in an earthen vessel; and the priest shall take some of the dust that is on the floor of the tabernacle and put it into the water.
Numbers 5:17 Cross References - WEB
Exodus 30:18
18 “You shall also make a basin of bronze, and its base of bronze, in which to wash. You shall put it between the Tent of Meeting and the altar, and you shall put water in it.
Numbers 19:2-9
2 “This is the statute of the law which Yahweh has commanded. Tell the children of Israel to bring you a red heifer without spot, in which is no defect, and which was never yoked.
3 You shall give her to Eleazar the priest, and he shall bring her outside of the camp, and one shall kill her before his face.
4 Eleazar the priest shall take some of her blood with his finger, and sprinkle her blood toward the front of the Tent of Meeting seven times.
5 One shall burn the heifer in his sight; her skin, and her meat, and her blood, with her dung, shall he burn.
6 The priest shall take cedar wood, hyssop, and scarlet, and cast it into the middle of the burning of the heifer.
7 Then the priest shall wash his clothes, and he shall bathe his flesh in water, and afterward he shall come into the camp, and the priest shall be unclean until the evening.
8 He who burns her shall wash his clothes in water, and bathe his flesh in water, and shall be unclean until the evening.
9 “A man who is clean shall gather up the ashes of the heifer, and lay them up outside of the camp in a clean place; and it shall be kept for the congregation of the children of Israel for use in water for cleansing impurity. It is a sin offering.
Job 2:12
12 When they lifted up their eyes from a distance, and didn’t recognize him, they raised their voices, and wept; and they each tore his robe, and sprinkled dust on their heads toward the sky.
Jeremiah 17:13
13 Yahweh, the hope of Israel, all who forsake you will be disappointed. Those who depart from me will be written in the earth, because they have forsaken Yahweh, the spring of living waters.
Lamentations 3:29
29 Let him put his mouth in the dust, if it is so that there may be hope.
John 8:6
6 They said this testing him, that they might have something to accuse him of. But Jesus stooped down and wrote on the ground with his finger.
John 8:8
8 Again he stooped down and wrote on the ground with his finger.