וְעַ֣ל ׀ מִזְבַּ֣ח הַזָּהָ֗ב יִפְרְשׂוּ֙ בֶּ֣גֶד תְּכֵ֔לֶת וְכִסּ֣וּ אֹת֔וֹ בְּמִכְסֵ֖ה ע֣וֹר תָּ֑חַשׁ וְשָׂמ֖וּ אֶת־בַּדָּֽיו׃
And upon the golden altar they shall spread a cloth of blue, and cover it with a covering of sealskin, and shall set the staves thereof.
Read halakhic rulings (Jewish law) on Numbers 4:11: and classical halakhic sources.