I think it is probable that some of the Lord's hidden ones might have painted out to Cyrus what the Lord's prophet Isaiah had predicted concerning him. But that Cyrus knew nothing of the Lord in a way of grace, though the Lord stirred up his mind to those acts of clemency, seems decided, Isaiah 45:4-5. And it is possible from the awful end of Belshazzar, who died in the very act of profaning the holy vessels of the temple, that Cyrus sent away those sacred things from a dread and fear.
Related Commentaries of Ezra 1:2
Ezra 1:2-4
2 Thus saith Cyrus king of Persia, The LORD God of heaven hath given me all the kingdoms of the earth; and he hath charged me to build him an house at Jerusalem, which is in Judah.
3 Who is there among you of all his people? his God be with him, and let him go up to Jerusalem, which is in Judah, and build the house of the LORD God of Israel, (he is the God,) which is in Jerusalem.
4 And whosoever remaineth in any place where he sojourneth, let the men of his place helpa him with silver, and with gold, and with goods, and with beasts, beside the freewill offering for the house of God that is in Jerusalem.