In later intertestamental Jewish literature, the abyss was the underworld, either the home of the dead (sheol) or, finally, the region of the rebellious spirits (Hell). Abaddon is referred to as "the angel of the abyss" in Revelation 9:11. The word "abyss" is also used in the Old Testament to refer to the grave (Psalms 89:47; Ecclesiastes 9:5). In the New Testament, the abyss is a term used for hell. In Mark 13:27 and Luke 21:26, Jesus says that he will come like a thief in the night to find his followers who are sleeping in the woods. When they don't go to meet him, he says that they won't know the time when he returns. Revelation 9:1-11 describes a vision John sees in which a great star falls from heaven and lands in the ocean. A flood occurs on earth, and those who live on it are saved from death by being taken into two boats. One boat represents the righteous people of the world, and the other boat represents the unrighteous people of the world. The flood lasts only a month, but during this time the occupants of the two boats have different experiences. Those in the first boat see what looks like the sun and moon, stars, and islands. But those in the second boat suffer from intense heat and darkness.