‘Nebuchadnezzar spoke and said, “Blessed be the God of Shadrach, Meshach and Abednego, who has sent his supernatural agency, and delivered his servants who trusted in him, and they have changed the king's word, and have surrendered their bodies, that they might not serve or worship any god, apart from their own God.”
Nebuchadnezzar acknowledges the power and faithfulness of their God, and the remarkable faith, trust and willingness to yield all, of the three men.
‘His supernatural agency.' More than an angel, but similar to the idea of ‘the Angel of Yahweh'. Note also the emphasis put on their faith. They had full trusted God to do what was right even when everything seemed to be going wrong.
‘They have changed the king's word.' Once a sovereign lord had made a decree it was not usual for it to be altered (in the case of the Medes and Persians it could not be). These men had achieved what very few had ever done.
‘And have surrendered their bodies.' They had not hesitated to surrender their whole existence into God's hands, rather than worship any god but their own.