He spake unadvisedly: so this word is thought to signify, Leviticus 5:4 Proverbs 12:18. Or, he spake, as the word commonly signifies. Not that it was in itself 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, Numbers 20:8-10; 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's infirmity, and rather imply than express his fault.
Related Commentaries of Psalms 106:33
Psalms 106:33
33 Because they provoked his spirit, so that he spake unadvisedly with his lips.