Jamieson, Fausset and Brown on Daniel 3:23

23. fell down--not cast down; for those who brought the three youths to the furnace, perished by the flames themselves, and so could not cast them in. Here follows an addition in the Septuagint, Syrian, Arabic, and Vulgate versions. "The Prayer of Azarias," and "The Song of the Three Holy Children." It is not in the Chaldee. The hymn was sung throughout the whole Church in their liturgies, from the earliest times [Rufinus in Commentary on the Apostles Creed, and Athanasius]. The "astonishment" of Nebuchadnezzar in Da 3:24 is made an argument for its genuineness, as if it explained the cause of his astonishment, namely, "they walked in the midst of the fire praising God, but the angel of the Lord came down into the oven" (vs. 1 and vs. 27 of the Apocryphal addition). But Da 3:25 of English Version explains his astonishment, without need of any addition.