Numbers 4:13

and have removed the ashes of the altar, and have spread over it a garment of purple;

Exodus 27:1-8

And thou hast made the altar of shittim wood, five cubits the length, and five cubits the breadth -- the altar is square -- and three cubits its height.

Exodus 39:1

And of the blue, and the purple, and the scarlet, they made coloured garments, to minister in the sanctuary; and they make the holy garments which are for Aaron, as Jehovah hath commanded Moses.

Exodus 39:41

the coloured clothes to minister in the sanctuary, the holy garments for Aaron the priest, and the garments of his sons, to act as priest in.

Leviticus 6:12-13

And the fire on the altar is burning on it, it is not quenched, and the priest hath burned on it wood morning by morning, and hath arranged on it the burnt-offering, and hath made perfume on it with the fat of the peace-offerings;

Numbers 4:6-9

and have put on it a covering of badger skin, and have spread a garment completely of blue above, and have placed its staves.

Numbers 4:11-12

'And on the golden altar they spread a garment of blue, and have covered it with a covering of badger skin, and have placed its staves;

Treasury of Scripture Knowledge

Summary

And they shall take away the ashes from the altar, and spread a purple cloth thereon:

The embers of the sacred fire seem to have been removed in the grate, which was carried apart from the brazen altar; both being covered from view by purple cloths

General references

Bible References

The embers of the sacred fire seem to have been removed in the grate, which was carried apart from the brazen altar; both being covered from view by purple cloths

Numbers 4:6
and have put on it a covering of badger skin, and have spread a garment completely of blue above, and have placed its staves.
Exodus 27:3
And thou hast made its pots to remove its ashes, and its shovels, and its bowls, and its forks, and its fire-pans, even all its vessels thou dost make of brass.
Exodus 39:1
And of the blue, and the purple, and the scarlet, they made coloured garments, to minister in the sanctuary; and they make the holy garments which are for Aaron, as Jehovah hath commanded Moses.
Leviticus 6:12
And the fire on the altar is burning on it, it is not quenched, and the priest hath burned on it wood morning by morning, and hath arranged on it the burnt-offering, and hath made perfume on it with the fat of the peace-offerings;

General references

Numbers 4:8
and they have spread over them a garment of scarlet, and have covered it with a covering of badger skin, and have placed its staves,