Fiery - Vine's Expository Dictionary of New Testament Words
Fiery[ 1,,G4448, puroo ]
to set on fire, burn up" (from pur, "fire"), always used in the Passive Voice in the NT, is translated "fiery" in Ephesians 6:16, metaphorically of the darts of the evil one; "fire-tipped" would perhaps bring out the verbal force of the word. The most ancient mss. have the article repeated, lit., "the darts of the evil one, the fiery (darts)," marking them as particularly destructive. Some mss. omit the repeated article. In ancient times, darts were often covered with burning material. See BURN, FIRE, TRY, Note
(1) For Hebrews 10:27, RV, See FIRE (cp. FIERCE, B, No. 2).
(2) For purosis, "a fiery trial," 1 Peter 4:12, (lit., "a burning," as in Revelation 18:9, Revelation 18:18), "a refining, or trial by fire," See TRIAL.