What impressed Nebuchadnezzar most of all was that now the three Jews had been joined by a fourth man, and this one looked like “a son of the gods.” Porteous69 and the majority of Jewish scholars have identified this person as an angel. For example, Slotki remarks, “The Talmud asserts that it was the archangel Gabriel (Pes. 118a, b).”70 According to Lacocque, “The expression is used in the inscriptions at Karatepe and Ugarit where it designates the members of the divine court.”71 However, the expression “a son of the gods” ascribes deity to the being, since an offspring of the gods partakes of the divine nature. Young remarks: “The meaning is son of deity, i.e., a Divine Person, one of the race of the gods, a supernatural being.”72 The NRSV's “the appearance of a god” seems to capture the idea well, for the king believed that he had seen no less than a god in the flames with the three Hebrews. The KJV renders this phrase “the Son of God,” an apparent allusion to the second person of the Trinity. Either the NIV or KJV translation is possible grammatically. In biblical Aramaic the plural noun ’ĕlāhîn may be assumed to have the same force as ’ĕlōhîm in biblical Hebrew, which can be rendered as a plural, “gods,” or as a singular, “God,” when denoting the true God, the plural form being an attempt to express the divine fullness and majesty.73 In this context, however, the translation of the NIV and most modern versions is to be preferred, since Nebuchadnezzar was polytheistic and had no conception of the Christian Trinity. Thus the pagan king only meant that the fourth figure in the fire was divine. From the Christian perspective, we know that the preincarnate Christ did appear to individuals in the Old Testament. Most likely the fourth man in the fire was the angel of the Lord, God himself in the person of his Son Jesus Christ, a view held by many expositors (cf. comments on 6: 21–22).74 It is certainly true that when believers go through fiery trials Christ is with them. The three Hebrews experienced literally the promise, “When you walk through the fire, you will not be burned; the flames will not set you ablaze”(Isa 43:2).
Miller, Stephen B. Daniel: An Exegetical and Theological Exposition of Holy Scripture: 18 (The New American Commentary) (Kindle Locations 2197-2218). B&H Publishing Group. Kindle Edition.