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Miriam and Aaron spoke against Moses because of the Cushite woman he had taken [into his household as his wife]: “He took a Cushite woman!”

They said, “Has יהוה spoken only through Moses? Has [God] not spoken through us as well?” יהוה heard it.

Now Moses himself was very humble, more so than any other human being on earth.

and [God] said, “Hear these My words: When prophets of יהוה arise among you, I make Myself known to them in a vision, I speak with them in a dream.

Not so with My servant Moses; he is trusted throughout My household.

When the Ark was to set out, Moses would say:
Advance, O יהוה !
May Your enemies be scattered,
And may Your foes flee before You!

And when it halted, he would say:
Return, O יהוה,
You who are Israel’s myriads of thousands!

ויפצו איביך [RISE UP, O LORD] AND LET THINE ENEMIES BE SCATTERED — i.e. those who massed for battle.

משנאיך THOSE THAT HATE THEE — These are those who hate Israel, because whoever hates Israel, hates “Him who spoke and the world came into existence”, as it is said, (Psalms 83:3, 4) “[For lo, thine enemies are in an uproar] and they that hate Thee have lifted up the head” — and who are these that hate Thee? The next verse states this (v. 4): “They who have taken crafty counsel against thy people” (Sifrei Bamidbar 84:4).

Take the Levites from among the Israelites and purify them.

This is what you shall do to them to purify them: sprinkle on them water of purification, and let them go over their whole body with a razor, and wash their clothes; thus they shall be purified.

Thereafter the Levites shall be qualified for the service of the Tent of Meeting, once you have purified them and designated them as an elevation offering.