Numbers 4:13

ודשנו את המזבח AND THEY SHALL TAKE AWAY THE ASHES FROM THE ALTAR — from the brazen altar. ודשנו means, they shall remove the ashes from off it (cf. Rashi on Exodus 27:3). ופרשו עליו בגד ארגמן AND THEY SHALL SPREAD A GARMENT OF RED PURPLE THEREON — But the fire that descended from heaven on the altar (cf. Rashi on Leviticus 1:7) lay beneath the garment in the form of a lion during the journeyings; it did not, however, burn it because they inverted a large vessel of copper over it (cf. Yoma 21b).

וְדִשְּׁנ֖וּ אֶת־הַמִּזְבֵּ֑חַ וּפָרְשׂ֣וּ עָלָ֔יו בֶּ֖גֶד אַרְגָּמָֽן׃

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