Because they provoked his spirit - literally, "They made his spirit bitter," or they embittered his soul. They threw him off his guard, so that instead of manifesting the meekness and gentleness which so eminently characterized him in general (see Numbers 12:3), he gave way to expressions of anger. See Numbers 20:10.

So that he spake unadvisedly with his lips - Passionately; in a severe, harsh, and threatening manner. He did not bear with them as he should have done; he did not refer to God, to his power, and to his goodness as he should have done; he spake as if the whole thing depended on him and Aaron: "Hear now, ye rebels; must we fetch you water out of this rock?" The word rendered "spake unadvisedly" - בטא bâṭâ' - means properly to "babble;" and then, to talk idly, or unadvisedly; to utter that which has no meaning, or an improper meaning. Let us not harshly blame Moses, until we are placed in circumstances similar to his, and see how we would ourselves act. Who is there that would not have been provoked as he was, or even to a greater degree? If there are any such, let them "cast the first stone."

They provoked his spirit - המרו himru, from מרה marah, to rebel: they brought it into a rebellious state; he was soured and irritated, and was off his guard.

So that he spake unadvisedly with his lips - For this sentence we have only these two words in the Hebrew, ויבטא בשפתיו vayebatte bisephathaiv, he stuttered or stammered with his lips, indicating that he was transported with anger. See the notes on Numbers 20:10-12 (note).

Because they provoked his spirit;.... Though he was a very meek man, meeker than any upon the face of the earth, Numbers 12:2, yet, being greatly provoked, let fall some passionate and undue expressions: and this was not only his sin, but the fault of those also that provoked him, and with this view it is mentioned. The Targum is,

"for they rebelled against his Holy Spirit;''

the Holy Spirit of God, as in Isaiah 63:10. Jarchi interprets it of Moses and Aaron provoking the Spirit of God; which sense is mentioned, by Aben Ezra and Kimchi; though they seem to prefer the former, and which seems best. Some interpret it of the Israelites, that they caused Moses and Aaron to provoke his Spirit.

So that he spake unadvisedly with his lips; that is, Moses spake,

saying, Hear now, ye rebels, must we, or "can we",

fetch you water out of this rock? Which words were spoken in an angry passionate way, calling them rebels, and expressing diffidence about getting water out of the rock; which was the thing that was so displeasing to God, because they did not believe him to sanctify him in the eyes of the children of Israel, Numbers 25:10. Jarchi, as before, understands this of God, of his speaking, pronouncing, and declaring, that Moses and Aaron should not bring the congregation into the land of Canaan, Numbers 25:18, and so the word "unadvisedly" may be left out, and only read, "he spake with his lips"; but the other sense is to be preferred.

Because they provoked his spirit, so that he spake unadvisedly with his lips.

106:13-33 Those that will not wait for God's counsel, shall justly be given up to their own hearts' lusts, to walk in their own counsels. An undue desire, even for lawful things, becomes sinful. God showed his displeasure for this. He filled them with uneasiness of mind, terror of conscience, and self-reproach. Many that fare deliciously every day, and whose bodies are healthful, have leanness in their souls: no love to God, no thankfulness, no appetite for the Bread of life, and then the soul must be lean. Those wretchedly forget themselves, that feast their bodies and starve their souls. Even the true believer will see abundant cause to say, It is of the Lord's mercies that I am not consumed. Often have we set up idols in our hearts, cleaved to some forbidden object; so that if a greater than Moses had not stood to turn away the anger of the Lord, we should have been destroyed. If God dealt severely with Moses for unadvised words, what do those deserve who speak many proud and wicked words? It is just in God to remove those relations that are blessings to us, when we are peevish and provoking to them, and grieve their spirits.