Ezra 1:2 Commentary - English Annotations on the Holy Bible by Matthew Poole

All the kingdoms of the earth, to wit, in those parts of the world; all that vast empire formerly under the Assyrians and Babylonians. The gift of which he ascribes to the great God, either by virtue of those common notions which were in the minds of the heathens, who though they worshipped idols, yet many of them did acknowledge a true and supreme God; or by that clear and express prophecy of Isaiah concerning him, Isa 44:28; 45:1,13, so long before he was born; which prophecy the Jews had doubtlessly showed him, which also carried a great evidence with it, especially to him, who was so highly gratified and encouraged by it; or by a special illumination which God vouchsafed to him, as he did to Nebuchadnezzar and Darius, and some others of the heathen princes.

He hath charged me; either by his prophets, Isaiah formerly, or Daniel now; or by an inward suggestion to his mind.