Numbers 4:13

And they shall take away the ashes from the altar, and spread a purple cloth on it.

Exodus 27:1-8

And you shall make an altar of acacia-wood, five cubits long and five cubits broad. The altar shall be square. And the height of it shall be three cubits.

Exodus 39:1

And of the blue, and purple, and scarlet, they made woven garments for ministering in the sanctuary. And they made the holy garments for Aaron, even as Jehovah commanded Moses.

Exodus 39:41

the woven garments for ministering in the sanctuary, and the holy garments for Aaron the priest, and his sons' garments, to minister in the priest's office.

Leviticus 6:12-13

And the fire on the altar shall be kept burning on it. It shall not be put out. And the priest shall burn wood on it every morning, and lay the burnt offering in order on it. And he shall burn on it the fat of the peace offerings.

Numbers 4:6-9

And they shall put on it the covering of dugong skins, and shall spread over it a cloth wholly of blue, and shall put in its staves.

Numbers 4:11-12

And upon the golden altar they shall spread a cloth of blue, and cover it with a covering of badgers' skins, and they shall put the staves into it.

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 they shall put on it the covering of dugong skins, and shall spread over it a cloth wholly of blue, and shall put in its staves.
Exodus 27:3
And you shall make its pans to receive its ashes, and its shovels, and its basins, and its flesh-hooks, and its fire-pans. All the vessels of it you shall make of bronze.
Exodus 39:1
And of the blue, and purple, and scarlet, they made woven garments for ministering in the sanctuary. And they made the holy garments for Aaron, even as Jehovah commanded Moses.
Leviticus 6:12
And the fire on the altar shall be kept burning on it. It shall not be put out. And the priest shall burn wood on it every morning, and lay the burnt offering in order on it. And he shall burn on it the fat of the peace offerings.

General references

Numbers 4:8
And they shall spread upon them a cloth of scarlet and cover it with a covering of dugong skins, and they shall put in its staves.