Numbers 4:13

Overview - Numbers 4
The age at which the Levites were to begin to serve, and the duration of the service.
The duty of the Kohathites.
16 The charge of Eleazar.
17 The office of the priests.
21 The duty of the Gershonites;
29 of the Merarites.
34 The number of the Kohathites;
38 of the Gershonites
42 and of the Merarites.
Treasury of Scripture Knowledge

Numbers 4:13  (King James Version)
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.
Numbers 4:6-9 Numbers 4:11 Numbers 4:12 ; Exodus 27:3-5 ; Exodus 39:1 Exodus 39:41 Leviticus 6:12 Leviticus 6:13