Revelation 9:1

Again John saw a "star" (cf. Revelation 6:13; Revelation 8:10), but this time the "star" was an intelligent being. If "fallen" (Gr. peptokota) has theological connotations, the "star" may refer to Satan (Revelation 9:2; Revelation 9:11; cf. Revelation 1:20; Job 38:7; Luke 10:18) or some other fallen angel. If, on the other hand, "fallen" simply describes his condition as having come to earth from heaven, an unfallen angel is probably in view. Since this angelic being simply carries out God’s instructions faithfully, I tend to think he is an unfallen angel. The "bottomless pit" (lit. shaft of the abyss) is the abode of Satan (Revelation 9:11; Revelation 20:1-3), some demons (cf. Luke 8:31; 2 Peter 2:4; Judges 1:6), and the beast (Revelation 11:7; Revelation 17:8). It is evidently a preliminary prison, not their final abode, which is the lake of fire (i.e., hell, Revelation 19:20; Revelation 20:10; cf. Matthew 25:41), from which this angel is about to release some of them temporarily. The angel received the key to the door of this pit from a greater authority, possibly God Himself.