I. Concerning their clothes; they must wear linen garments when they went in to minister or do any service in the inner court, or in the sanctuary, and nothing that was woollen, because it would cause sweat, v. 17, 18. They must dress themselves cool, that they might go the more readily about their work; and they had the more need to do so because they were to attend the altars, which had constant fires upon them. And they must dress themselves clean and sweet, and avoid every thing that was sweaty and filthy, to signify the purity of mind with which the service of God is to be attended to. Sweat came in with sin and was part of the curse. In the sweat of thy face shalt thou eat bread. Clothes came in with sin, coats of skins did; and therefore the priests must use as little and as light clothing as possible, and not such as caused sweat. When they had finished their service they must change their clothes again, and lay up their linen garments in the chambers appointed for that purpose, v. 19, as before, ch. xlii. 14. They must not go among the people with their holy garments on, lest they should imagine themselves sanctified by the touch of them; or, They shall sanctify the people, that is (as it is explained, ch. xlii. 14), they shall approach to those things which are for the people, in their ordinary garments.