Wherefore king Darius {d} signed the writing and the decree.

(d) In this is condemned the wickedness of the king, who would be set up as a god, and did not care what wicked laws he approved for the maintenance of it.

Jamieson-Fausset-Brown Bible Commentary

9. Such a despotic decree is quite explicable by remembering that the king, as the incarnation of Ormuzd, might demand such an act of religious obedience as a test of loyalty. Persecuting laws are always made on false pretenses. Instead of bitter complaints against men, Daniel prays to God. Though having vast business as a ruler of the empire, he finds time to pray thrice a day. Daniel's three companions (Da 3:12), are not alluded to here, nor any other Jew who conscientiously may have disregarded the edict, as the conspirators aimed at Daniel alone (Da 6:5).

Matthew Henry's Concise Commentary

6:6-10 To forbid prayer for thirty days, is, for so long, to rob God of all the tribute he has from man, and to rob man of all the comfort he has in God. Does not every man's heart direct him, when in want or distress, to call upon God? We could not live a day without God; and can men live thirty days without prayer? Yet it is to be feared that those who, without any decree forbidding them, present no hearty, serious petitions to God for more than thirty days together, are far more numerous than those who serve him continually, with humble, thankful hearts. Persecuting laws are always made on false pretences; but it does not become Christians to make bitter complaints, or to indulge in revilings. It is good to have hours for prayer. Daniel prayed openly and avowedly; and though a man of vast business, he did not think that would excuse him from daily exercises of devotion. How inexcusable are those who have but little to do in the world, yet will not do thus much for their souls! In trying times we must take heed, lest, under pretence of discretion, we are guilty of cowardice in the cause of God. All who throw away their souls, as those certainly do that live without prayer, even if it be to save their lives, at the end will be found to be fools. Nor did Daniel only pray, and not give thanks, cutting off some part of the service to make the time of danger shorter; but he performed the whole. In a word, the duty of prayer is founded upon the sufficiency of God as an almighty Creator and Redeemer, and upon our wants as sinful creatures. To Christ we must turn our eyes. Thither let the Christian look, thither let him pray, in this land of his captivity.