Numbers 19:17 gives the specific procedure for the purification water using ashes of the red heifer — the means for the third and seventh day cleansing.

Numbers 19:18 describes the sprinkling of purification water on persons and objects — the practical execution of the purification ritual.

Numbers 19:19 repeats the third and seventh day sprinkling, detailing the same purification procedure.

Numbers 31:19 applies the same third- and seventh-day purification to those who touched the slain in battle — identical law.

Hebrews 9:13 directly refers to the red heifer ashes that purify the flesh, quoting the ritual behind this verse.

Psalm 51:7 alludes to the hyssop used in Numbers 19:18 for purification — David applies the ritual metaphorically to spiritual cleansing from sin.

Ezekiel 36:25 uses the same sprinkling imagery from Numbers 19:12-18 to promise future spiritual cleansing — a prophetic application of the ritual.

John 13:10 contrasts the need for repeated OT washings with Jesus' complete cleansing—once bathed, fully clean.

Leviticus 15:13 requires a seven-day purification for a bodily discharge, paralleling the seven-day cleansing from corpse impurity.