Adam Clarke on Psalms 75:4

I said unto the fools - I have given the idolatrous Chaldeans sufficient warning to abandon their idols, and worship the true God; but they would not. I have also charged the wicked, to whom for a season I have delivered you because of your transgressions, not to lift up their horn - not to use their power to oppress and destroy. They have, notwithstanding, abused their power in the persecutions with which they have afflicted you. For all these things they shall shortly be brought to an awful account. On the term horn, see the note on Luk 1:69.