Adam Clarke on Psalms 119:46

I will speak - before kings - Dr. Delaney supposes that this is spoken in reference to Achish, king of Gath, whom David had instructed in the Jewish religion; but we have already seen that it is most likely that the Psalm was compiled under the Babylonish captivity. But the words may with more propriety be referred to the case of Daniel, and other bold and faithful Israelites, who spoke courageously before Nebuchadnezzar, Belshazzar, and Darius. See the books of Daniel, Ezra, and Nehemiah.