John Wesley on Exodus 38:8

This laver signified the provision that is made in the gospel for cleansing our souls from the pollution of sin by the merit of Christ, that we may be fit to serve the holy God in holy duties. This is here said to be made of the looking - glasses of the women that assembled at the door of the tabernacle. It should seem these women were eminent for devotion, attending more constantly at the place of public worship than others, and notice is here taken of it to their honour. These looking - glasses were of the finest brass, burnished for that purpose. In the laver, either they were artfully joined together, or else molten down and cast anew; but it is probable the laver was so brightly burnished that the sides of it still served for looking - glasses, that the priests when they came to wash might there see their faces, and so discover the spots to wash them clean.