Numbers 19:4
And Eleazar the priest shall take of her blood with his finger, and sprinkle of her blood directly before the tabernacle of the congregation seven times:
Cross-reference
Leviticus 4:6 also involves sprinkling blood seven times toward the sanctuary with the finger, matching the red heifer's ritual.
Leviticus 4:17 repeats the sevenfold sprinkling of blood before the Lord, identical to the red heifer's action in Numbers 19:4.
In Leviticus 16:14, the same sevenfold sprinkling of blood before the mercy seat occurs on the Day of Atonement, reinforcing the purification pattern.
In Leviticus 16:19, blood is sprinkled seven times on the altar for cleansing, mirroring the red heifer's seven sprinklings.
Hebrews 9:13 directly references the ashes of the heifer for ceremonial cleansing, linking the OT ritual to NT purification.
Hebrews 9:14 contrasts the heifer's external cleansing with Christ's blood cleansing the conscience, showing the greater reality.
Hebrews 12:24 speaks of 'the blood of sprinkling' as Christ's, echoing the OT sprinkling motif from the red heifer and other rituals.
1 Peter 1:2 mentions 'sprinkling of the blood of Jesus Christ,' a typological echo of the red heifer's sprinkling for sanctification.