To sanctify, means in this place to set apart. Job did so concerning his sons. Job 1:5. Washing the clothes, signifying by an outward sign, somewhat intended of an inward effect. Reader! may you and I have that washing spoken of, Titus 3:5-6.
Related Commentaries of Exodus 19:10
Exodus 19:10
10 And the LORD said unto Moses, Go unto the people, and sanctify them to day and to morrow, and let them wash their clothes,