pre-tribbers read the whole Bible, not just one scripture poorly interpreted. Imminency means that the Rapture could occur at any moment. It does not mean that we know when.
From the very earliest days of the church, the apostles and first-generation Christians nurtured an earnest expectation and fervent hope that Christ might suddenly return at any time to gather His church to heaven. James, writing what was probably the earliest of the New Testament epistles, expressly told his readers that the Lord’s return was imminent:
Be patient, brethren, until the coming of the Lord. See how the farmer waits for the precious fruit of the earth, waiting patiently for it until it receives the early and latter rain. You also be patient. Establish your hearts, for the coming of the Lord is at hand. Do not grumble against one another, brethren, lest you be condemned. Behold, the Judge is standing at the door! (James 5:7–9, emphasis added).
Peter echoed that same expectation when he wrote, “The end of all things is at hand; therefore be serious and watchful in your prayers” (1 Pet 4:7). The writer of Hebrews cited the imminent return of Christ as a reason to remain faithful: “Let us consider one another in order to stir up love and good works, not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching” (Heb 10:24–25). He wrote, “Yet a little while, and He who is coming will come and will not tarry” (v. 37). And the apostle John made the most confident pronouncement of all: “Little children, it is the last hour; and as you have heard that the Antichrist is coming, even now many antichrists have come, by which we know that it is the last hour” (1 John 2:18). When John recorded his vision in the book of Revelation, he prefaced it by saying these things “must shortly take place” (Rev 1:1).
The New Testament writers often wrote of Christ’s “appearing,” and they never failed to convey the sense that this could happen imminently. “And now, little children, abide in Him, that when He appears, we may have confidence and not be ashamed before Him at His coming” (1 John 2:28; cf. 3:2; Col 3:4; 2 Tim 4:8; 1 Pet 5:4).
All those texts suggest that in the early church expectation of Christ’s imminent return ran high.
A solid conviction that Christ could return at any time permeates the whole NT. When the apostle Paul described the Lord’s coming for the church, he used personal pronouns that show he clearly was convinced he himself might be among those who would be caught up alive to meet the Lord: “We who are alive and remain until the coming of the Lord … . we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air” (1 Thess 4:15, 17, emphasis added). He obviously looked for Christ to return in his lifetime. He furthermore made it plain that a watchful, hopeful expectancy about Christ’s Second Coming is one of the godly attitudes divine grace teaches all believers: “For the grace of God that brings salvation has appeared to all men, teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age, looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ” (Titus 2:11–13, emphasis added).
http://www.gty.org/resources/articles/A368