Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[250] However, while Daniel was in so great dignity, and in so great favor with Darius, and was alone intrusted with every thing by him, a having somewhat divine in him, he was envied by the rest; for those that see others in greater honor than themselves with kings envy them; and when those that were grieved at the great favor Daniel was in with Darius sought for an occasion against him, he afforded them no occasion at all, for he was above all the temptations of money, and despised bribery, and esteemed it a very base thing to take any thing by way of reward, even when it might be justly given him; he afforded those that envied him not the least handle for an accusation. So when they could find nothing for which they might calumniate him to the king, nothing that was shameful or reproachful, and thereby deprive him of the honor he was in with him, they sought for some other method whereby they might destroy him. When therefore they saw that Daniel prayed to God three times a day, they thought they had gotten an occasion by which they might ruin him; so they came to Darius and told him that the princes and governors had thought proper to allow the multitude a relaxation for thirty days, that no one might offer a petition or prayer either to himself or to the gods, but that he who shall transgress this decree shall be cast into the den of lions, and there perish.