Prayer of Azarias 1:23

23 So that the flame streamed forth above the furnace forty and nine cubits.

Prayer of Azarias 1:23 In-Context

21 And let them know that thou art God, the only God, and glorious over the whole world.
22 And the king's servants, that put them in, ceased not to make the oven hot with rosin, pitch, tow, and small wood;
23 So that the flame streamed forth above the furnace forty and nine cubits.
24 And it passed through, and burned those Chaldeans it found about the furnace.
25 But the angel of the Lord came down into the oven together with Azarias and his fellows, and smote the flame of the fire out of the oven;

The Brenton translation of the Septuagint is in the public domain.