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.
Jewish Publication Society of America Version (JPS1917) - Ezekiel 44:17 >And it shall be that when they enter in at the gates of the inner court, they shall be clothed with linen garments; and no wool shall come upon them, while they minister in the gates of the inner court, and within.