Numbers 4:13
Also, they must take away the ashes from the altar and spread a purple cloth over it.
Exodus 27:1-8
"You are to make the altar of acacia wood, seven feet six inches long, and seven feet six inches wide; the altar is to be square, and its height is to be four feet six inches.
Exodus 39:1
From the blue, purple, and scarlet yarn they made woven garments for serving in the sanctuary; they made holy garments that were for Aaron, just as the Lord had commanded Moses.
Exodus 39:41
the woven garments for serving in the sanctuary, the holy garments for Aaron the priest, and the garments for his sons to minister as priests.
Leviticus 6:12-13
but the fire which is on the altar must be kept burning on it. It must not be extinguished. So the priest must kindle wood on it morning by morning, and he must arrange the burnt offering on it and offer the fat of the peace offering up in smoke on it.
Numbers 4:6-9
Then they must put over it a covering of fine leather and spread over that a cloth entirely of blue, and then they must insert its poles.
Numbers 4:11-12
"They must spread a blue cloth on the gold altar, and cover it with a covering of fine leather; and they must insert its poles.