Numbers 4:5-6

5When the camp is to set out, Aaron and his sons shall go in and take down athe veil of the screen and cover bthe ark of the testimony with it. 6Then they shall put on it a covering of goatskin
The meaning of the Hebrew word is uncertain; compare Exodus 25:5
and spread on top of that a cloth all of blue, and shall put in its dpoles.
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