Numbers 4:13

And they shall cleanse the altar of the ashes, and spread a purple cloth thereon;

Exodus 27:1-8

And thou shalt make the altar of acacia-wood, five cubits the length, and five cubits the breadth; the altar shall be square; and the height thereof three cubits.

Exodus 39:1

And of the blue and purple and scarlet they made garments of service, for service in the sanctuary, and made the holy garments for Aaron; as Jehovah had commanded Moses.

Exodus 39:41

the garments of service, for service in the sanctuary; the holy garments for Aaron the priest, and his sons' garments, to serve as priests.

Leviticus 6:12-13

And the fire upon 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 upon it; and he shall burn thereon the fat of the peace-offerings.

Numbers 4:6-9

and shall put thereon a covering of badgers' skin, and shall spread over it a cloth wholly of blue, and shall put its staves to it.

Numbers 4:11-12

And upon the golden altar they shall spread a cloth of blue, and cover it with a covering of badgers' skin, and shall put its staves to 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 shall put thereon a covering of badgers' skin, and shall spread over it a cloth wholly of blue, and shall put its staves to it.
Exodus 27:3
And thou shalt make its pots to cleanse it of the fat, its shovels, and its bowls, and its forks, and its firepans; for all the utensils thereof thou shalt employ copper.
Exodus 39:1
And of the blue and purple and scarlet they made garments of service, for service in the sanctuary, and made the holy garments for Aaron; as Jehovah had commanded Moses.
Leviticus 6:12
And the fire upon 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 upon it; and he shall burn thereon 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 badgers' skin, and shall put its staves to it.