Numbers 6:10-21 describes the seven-day purification and offerings for a defiled Nazirite — directly parallel to the priestly cleansing process here.

Numbers 19:11-13 gives the general seven-day purification law for any defiled person — the priestly rule here applies the same principle specifically.

Hebrews 9:13 recalls OT purification rituals (like the red heifer) that cleanse the flesh — a type pointing to Christ's superior cleansing.

Hebrews 9:14 contrasts Christ's blood that purifies conscience with OT external cleansings — showing the fulfillment and superiority of the new covenant.