39 Aram “into the midst of the furnace.” For stylistic reasons the words “the midst of” have been left untranslated.
40 The deuterocanonical writings known as The Prayer of Azariah and The Song of the Three present at this point a confession and petition for God’s forgiveness and a celebration of God’s grace for the three Jewish youths in the fiery furnace. Though not found in the Hebrew/Aramaic text of Daniel, these compositions do appear in the ancient Greek versions.

In other versions

And these three men, Shadrach, Meshach, and Abednego, fell bound into the burning fiery furnace.

and these three men, firmly tied, fell into the blazing furnace.

And these three men, Shadrach, Meshach, and Abednego fell, bound, into the furnace of blazing fire.

So Shadrach, Meshach, and Abednego, securely tied, fell into the roaring flames.

But these men, the three of them, Shadrach, Meshach and Abednego, fell down into the midst of the furnace of blazing fire, and they were bound.

And these three men, Shadrach, Meshach, and Abed-nego, fell down bound into the midst of the burning fiery furnace.

Public Domain