Numbers 11:18

Sanctify yourselves against to-morrow. — (Comp. Exodus 19:10.) The Israelites were required to sanctify themselves by purification for the more immediate manifestation of the Divine presence, although their request was a sinful one, and was granted in judgment as well as — or even more than — in mercy. Comp. Psalms 106:15 : “And he gave them their request; but sent leanness into their soul.”