Daniel 3:27 (ESV)

27 And the satraps, the prefects, the governors, and the king’s counselors gathered together and saw that the fire had not had any power over the bodies of those men. The hair of their heads was not singed, their cloaks were not harmed, and no smell of fire had come upon them.

Everyone around the king sees with his own eyes the miracle that the fire has not done anything to the three friends. There is not the smallest burn, nor has the smallest piece of their clothing been affected by the fire, and there is not even the smell of fire upon them. The fire has not singed a single hair of their heads. When we read this our minds naturally go to these words of the Lord Jesus, Are not two sparrows sold for a penny? And not one of them will fall to the ground apart from your Father. But even the hairs of your head are all numbered. Fear not, therefore; you are of more value than many sparrows, Matthew 10:29–31.