Ezekiel 45:20
And so thou shalt do the seventh day of the month for every one that erreth, and for him that is simple: so shall ye reconcile the house.
Cross-reference
Ezekiel 45:18 describes the first day cleansing of the sanctuary; verse 20 adds a second cleansing on the seventh day, completing the ritual.
Leviticus 4:27-35 gives the law for unintentional sin offerings — the same category this atonement addresses.
Leviticus 16:20 details the Day of Atonement ritual for the tabernacle; Ezekiel 45:20 adapts this sanctuary atonement for the new temple.
Hebrews 5:2 describes the high priest's compassion for the ignorant — the same group this atonement covers.
Romans 5:10 describes reconciliation through Christ's death; Ezekiel 45:20's temple atonement prefigures this ultimate reconciliation.
Hebrews 2:17 presents Christ as High Priest making propitiation; Ezekiel 45:20's priestly atonement typifies Christ's work.
Psalm 19:12 acknowledges hidden faults — similar to the 'unintentional or ignorant' sins this atonement covers.