When they enter the gates of the inner court, they are to wear linen garments; they must not wear anything made of wool when they minister at the gates of the inner court or inside the temple.

Revelation 19:8
She was given clothing of fine linen, bright and pure." For the fine linen she wears is the righteous acts of the saints.

Exodus 28:42
Make linen undergarments to cover their bare flesh, extending from waist to thigh.

Exodus 28:43
Aaron and his sons must wear them whenever they enter the Tent of Meeting or approach the altar to minister in the Holy Place, so that they will not incur guilt and die. This is to be a permanent statute for Aaron and his descendants.

Exodus 39:27
For Aaron and his sons they made tunics of fine linen, the work of a weaver,

Ezekiel 44:27
And on the day he goes into the sanctuary, into the inner court, to minister in the sanctuary, he must present his sin offering, declares the Lord GOD.

And it shall come to pass, that when they enter in at the gates of the inner court, they shall be clothed with linen garments; and no wool shall come on them, whiles they minister in the gates of the inner court, and within.