John Gill Commentary Leviticus 22:6

"the soul that toucheth any such shall be unclean until the even, and shall not eat of the holy things, unless he bathe his flesh in water." — Leviticus 22:6 (ASV)

The soul which has touched any such will be unclean until even. Which is the time fixed by the several laws for such uncleannesses, see (Leviticus 11:31) (Leviticus 15:5Leviticus 15:7Leviticus 15:16).

And will not eat of the holy things, unless he wash his flesh with water. In forty seahs of water, as the Targum of Jonathan; yes, when the evening is come, he may not eat of the heave or wave offerings, until he has dipped himself all over in water.

Nor should any eat of the Lord's supper under the New Testament, but such as are first baptized in water.