That they die not - See Exodus 28:35 note.

They shall wash with water, that they die not - This was certainly an emblematical washing; and as the hands and the feet are particularly mentioned, it must refer to the purity of their whole conduct. Their hands - all their works, their feet - all their goings, must be washed - must be holiness unto the Lord. And this washing must be repeated every time they entered into the tabernacle, or when they came near to the altar to minister. This washing was needful because the priests all ministered barefoot; but it was equally so because of the guilt they might have contracted, for the washing was emblematical of the putting away of sin, or what St. Paul calls the laver of regeneration and the renewing of the Holy Ghost, (Titus 3:5), as the influences of the Spirit must be repeated for the purification of the soul, as frequently as any moral defilement has been contracted.

When they go into the tabernacle of the congregation, they shall wash with water,.... The laver standing near the door of the tabernacle, they washed at it as soon as they entered; and no man, we are told (c), entered into the court before he washed, even though he was clean; though he had contracted no filthiness, and even though he had washed his hands and feet at home, he was obliged to do it when he went into the tabernacle, before he attempted to perform any service. This intimates to us the necessity as of pure hearts, so of pure hands, in order to compass the altar of God, to attend public worship, and particularly prayer, in which holy hands should be lifted up, 1 Timothy 2:8,

that they die not: sin exposes to death, eternal death; that is the wages of it, and it is only the blood of Christ, and being washed in that, that can secure from it:

or when they come near to the altar to minister; to the altar of burnt offering to minister there, by laying on the wood and the pieces in order, and burning them on it, as follows:

to burn offering made by fire to the Lord; no man was fit for this service, or might be admitted to it, until he was washed; and it was usual among other nations to wash before they entered on religious service (d); even in the East Indies, the priests do not sacrifice to their idols before they wash in water that is about the temple (e); which seems to be a satanical imitation of this practice among the Jews.

(c) Misn. Yoma, c. 3. sect. 3.((d) Vid. Outram de Sacrificiis, l. 1. c. 6. sect. 14. (e) Vartoman. Navigat. l. 5. c. 23.

When they go into the tabernacle of the congregation, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn offering made by fire unto the LORD:

30:17-21 A large vessel of brass, holding water, was to be set near the door of the tabernacle. Aaron and his sons must wash their hands and feet at this laver, every time they went in to minister. This was to teach them purity in all their services, and to dread the pollution of sin. They must not only wash and be made clean, when first made priests, but must wash and be kept clean, whenever they went to minister. It teaches us daily to attend upon God, daily to renew our repentance for sin, and our looking to the blood of Christ for remission; for in many things we daily offend.