'God Commanded' in the Bible

And he appointed, according to the order of David his father, the divisions of the priests to their service, and the Levites to their charges, to praise and serve before the priests, as the duty of every day required: the gatekeepers also by their divisions at every gate: for so had David the man of God commanded.

But he sent ambassadors to him, saying, What have I to do with you, you king of Judah? I come not against you this day, but against the house with which I am at war: for God commanded me to make haste: cease from meddling with God, who is with me, that he destroys you not.