Numbers 11:18-20

And say thou unto the people, Sanctify yourselves against to morrow, and ye shall eat flesh: for ye have wept in the ears of the LORD, saying, Who shall give us flesh to eat? for it was well with us in Egypt: therefore the LORD will give you flesh, and ye shall eat.

Say thou unto the people, Sanctify yourselves - i:e., 'prepare yourselves,' by repentance and submission, to receive tomorrow the flesh you clamour for. But it is evident that the tenor of the language implied a severe rebuke, and that the blessing promised would prove a curse (cf. Psalms 106:15, where the words, "He sent leanness into their soul," implies that the decay which was sent was not bodily, but spiritual.