Ezekiel 43:20 details the blood purification of the altar. Verse 26 summarizes this as seven days of atonement.

Ezekiel 43:22 prescribes the second day's sin offering. Verse 26 includes this in the seven-day cleansing ritual.

Exodus 29:30 states the high priest consecrates for seven days. Ezekiel's seven-day altar atonement mirrors this duration.

Leviticus 9:1 begins on the eighth day after seven days of ordination. Ezekiel's seven days also lead to the eighth day (v.27).

Leviticus 8:34 states that the seven-day ritual was commanded for atonement — similar to the seven-day atonement for the altar here.