THE BOTTOMLESS PIT.

Pits were recognized in the ancient world as a source of danger. They were used symbolically to describe the destruction awaiting those who turn to evil, those who concoct evil plots that, without realizing, they will fall into the very pit they have dug, by using their mouth as a tool or the pit created by divine judgment.
In biblical sources they are use to symbolizes the natural formation of evil in the heart of men and how it is tested through human action as a response to it. In Psalm 3, David describes it with vivid words, in this case David is the symbolization of the church being attack by the forces of evil using the wrongness of David's action in a moment of weakness:
"O Lord, rebuke me not in your anger, nor chasten me in your wrath ...O Lord heal me, for my bones are troubled. My soul also is sorely troubled ... Turn, O lord, save my life; deliver me for the sake of your steadfast love. For in death there is no remembrance of You; in Sheol who can give you praise?
I am weary with my moaning; every night I flood my bed with tears; I drench my coach with my weeping. My eye wastes away because of grief, it grows weak because of all my foes. Depart from me,  all you workers of evil; for the lord has heard the sound of my weeping." Psalm 6: 1-8
When we win the battle then we are worthy to attain resurrection from the dead (bottomless pit) and never die again as it is said by Jesus in Luke 20: 34- 36: "The sons of this age marry and are given in marriage; but those who are accounted worthy to attain to that age and to the resurrection from the dead neither marry nor are given in marriage, for they cannot die any more, because they are equal to angels and are sons of God, being sons of the resurrection."
The Bottomless Pit is a synonym for Sheol, the place of the dead, as David mention it in Psalm 15: 9-10: "Therefore my heart is glad, and my soul rejoices; my body also dwells secure. For You do not give me up to Sheol, or let your godly one see the Pit. You do show me the path of life; in Your presence there is fulness of joy, in your right hand are pleasures for evermore." Also in Proverbs 1:8-12 Solomon describe the actions that form the symbolic bottomless pit: "Hear, my son, your father's instruction (God as a spiritual Father), and reject not your mother's teaching (Jesus' teachings as a head of the church); for they are a fair garland for your head, and pendants for your neck. My son, if sinners entice you, do not consent. If they say, 'Come with us, let us lie in wait for blood (heart, soul and body are vulnerable to evil forces), let us wantonly ambush the innocent; like Sheol let us swallow them alive and whole, like those who go down the Pit."
The Bottomless Pit is also used symbolically for the source of the destruction of the earth and the location of demons and the devil as we can see in the narrative in Revelation 9: 1-11 "And the fifth angel blew his trumpet, and I saw a star fallen from heaven to earth, and he was given the key of the shaft of the Bottomless Pit; he opened the shaft of the Bottomless Pit, and from the shaft rose smoke like the smoke of a great furnace, and the sun (fertility power) and the air (breath of life) were darkened with the smoke from the shaft."
"Then from the smoke came locusts on the earth, and they were given power like the power of scorpions of the earth; they were told not to harm the grass (Job 5:25 Eliphaz promises Job that his descendants would be as numerous as the grass of the earth) of the earth or any green growth (Gen.1:30 God gives every green plant for food to every beast of the earth, and to every bird of the air; and in Gen.9 God blessed Noah and delivered every beast of the earth and every bird of the air and everything that creeps on the ground into his hand, and every moving thing that lives as food, as the way He gave the green plants) or any tree (Gen.2:9 And out of the ground the Lord God made to grow every tree that is pleasant to the sight) , but only those of mankind who have not the seal of God upon their foreheads; they (the scorpions) were allowed to torture them for five months, but not to kill them, and their torture was like the torture of a scorpion, when it stings a man. And in those days men will seek death and will not find it; they will long to die, and death will fly from them."
"In appearance the locusts were like horses arrayed for battle; on their heads were what looked like crowns of gold; their faces were like human faces, their hair like women's hair, and their teeth like lions' teeth; they had scales like iron breastplates, and the noise of their wings was like the noise of many chariots with horses rushing into battle. They have tails like scorpions, and stings, and their power of hurting men for five months lies in their tails. They have as king over them the angel of the Bottomless Pit; his name in Hebrew is Abaddon, and in Greek he is called Apol'lyon. Rev. 9: 1-11.