Daniel 6:26 - Matthew Poole's English Annotations on the Holy Bible

Tremble and fear before the God of Daniel; take heed how they speak evil of this great God, but own and honour him as such; whereof he gives the reason following. He is the living God, & c. You would take Darius by these words to be a convert: how far this went with him, and how long it lasted, who knoweth? Surely if he were in earnest, he would forsake his idolatry, and set up the worship of the true God in his kingdom, that his subjects might turn from dumb idols, as inconsistent with the living God and his worship. Howbeit, it is clear that Darius had learnt this doctrine from Daniel, whom he heard and honoured, and was the more convinced of it by this miraculous deliverance of Daniel from the lions.