Numbers 4:4-6

Amplified Bible, Classic Edition

⁴ This shall be the responsibility of the sons of Kohath in the Tent of Meeting: the most holy things.

⁵ When the camp prepares to set forward, Aaron and his sons shall take down the veil [screening the Holy of Holies] and cover the ark of the Testimony with it,

⁶ And shall put on it the covering of dolphin or porpoise skin, and shall spread over that a cloth wholly of blue, and shall put in place the poles of the ark.