When the Millennium is over the "dead"
(those who are still spiritually alive, but still having mortal souls during the Millennium)
will be judged according to their WORKS,

So there will definitely be sacrifice during the Millennium, because you know why?

Well, we already noted that there will be a lot of people who didn't make the First Resurrection who committed a lot of sins that haven't been forgiven.

Faith and belief in Jesus Christ won't cut it at that time because He will be there and EVERY knee shall bow and ALL SHALL KNOW that He is the Lord.

You see, faith is the substance and hope of that which you cannot see.

That which you see does not require faith.

Also, there will be those who go astray!

Yes, there will even be sin in the Millennium!

That comes as a surprise to many folks, but sin and death is not gone from among us until the lake of fire at the end of the Millennium consumes them away.

True, there will be no sinful flesh and Satan will be bound and will not be able to influence God's children during most of the Millennium.

But only after the Great White Throne judgment will there be no more sin, when death and the grave are swallowed up in the lake of fire.

Until then there's much work to be done.

So let's look at the measurements of The Altar beginning with verse 13.

First, the term "span" is "zereth" in Hebrew and means "the spread of the fingers" much like you would span an octave on a piano keyboard.

Verse 13 tells us (in almost undecipherable King Jame's language) that there is a "gutter" (see Moffat translation) around the base which is one cubit deep and one cubit wide and has a ledge or a rim around it about one span high.

This makes a trench or a "pit", like an ash pit, around the base (see note in Companion Bible on vs. 13 "higher place").

The Altar itself is 12 cubits square and 4 cubits high with the four horns projecting upward from it.

It rests upon it's settle (base) that is 14 cubits square and two cubits high.

The height and breadth are the same as Solomon's Temple in cubits except that this altar has ledges for the priests to walk round and the cubits are 1/7th larger.
Do you SEE?
These are spiritual measurements, not physical - not of this dimension!

There will be a 7 day cleansing and purification period of the Altar by the Priests of the Zadok before the "eighth day" when Christ will begin accepting the offerings of the people (see vs. 27).

"When they shall make it" means "when they shall have the charge of it", i.e. to have charge of The Altar to offer burnt offerings thereon and to sprinkle blood thereon once it is cleansed and purified in the following manner (vv. 19-26).

Again what we are seeing here in the sacrifices we are about to read of, is an analogy representing that which is spiritual.