Matthew Poole and continuators on Psalms 106:33

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

So this word is thought to signifie, Leviticus 5. 4. Prov. 12. 18. Or, he spake, as the word commonly signifies. Not that it was in it self a Sin to speak, but because he spake when he should have been silent; or he spake to the People, when God commanded him only to speak to the Rock, Numb. 20. 8, 9, 10. or, he spake, to wit, the provocation of his spirit, or such words as were agreeable to it, and might be expected from it. He mentions not here what Moses spake, because that was fully known from the History, and because he would throw a veil over Moses his infirmity, and rather imply than express his fault.