God's Word teaches that Lord Jesus comes 2 times to this earth. It was first written of in the Old Testament prophets...
Christ's 1st coming to die on the cross:
Zech 9:9
9 Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: he is just, and having salvation; lowly, and riding upon an ass, and upon a colt the foal of an ass.
That was declared at Jesus' 1st coming per Matthew 21:1-9.
Christ's 2nd coming with Power to Rule over all:
Zech 9:10
10 And I will cut off the chariot from Ephraim, and the horse from Jerusalem, and the battle bow shall be cut off: and he shall speak peace unto the heathen: and his dominion shall be from sea even to sea, and from river even to the ends of the earth.
KJV
The events to pay attention to in this 10th verse are, the cutting off of the chariot and horse from Jerusalem which represents battle. And the battle bow being cut off, meaning the end of all that strife in the world. And His dominion rule from sea to sea, etc., which is put for Christ's future reign over all nations with "a rod of iron" (Revelation 12:5; Psalms 2).
That is also what The New Testament prophecies show about our Lord Jesus' 2 times of coming. His 1st coming was to be meek as the Lamb slain to offer us forgiveness of sins. And His 2nd coming, which is still future, will be to take over all the kingdoms of this world on the 7th Trumpet (Revelation 11:15).
If you'll notice, there is no 3rd coming written of. Only 2:
Heb 9:28
28 So Christ was once offered to bear the sins of many; and unto them that look for Him shall He appear the second time without sin unto salvation.
KJV
Pre-tribulationalism wrongly teaches there are 3 comings by Christ. The 1st was His coming to die on the cross. The 2nd time, which they try to be sneaky and say it really isn't a 2nd time, is alleged to be prior to the "great tribulation" to gather the Church, originally what John Darby in 1830's Great Britain said was a "secret" coming. And then they teach the 2nd coming is after the tribulation returning with Jesus to do battle, which that actually is a 3rd one in their false teaching.
1st coming - Christ died on the cross for the remission of sins for those who believe.
2nd coming - to gather His Church and do battle, beginning His reign over all.
That's all that is written of in God's Word, just 2 times, just like the above Hebrews 9:28 says "the second time". The Pre-trib Rapture school can't even get that verse right, as they slice that verse up and only say, "unto them that look for Him", and leave off that "second time". Why would they do that?
They do it because they are preaching a false doctrine from men that is leaven 'added' to God's Word. Their pre-trib rapture idea simply is not written. So chop and slice Scripture is the order of their day.
Direct Scripture is available directly from our Lord Jesus as to the timing of His return to gather His Church. It is written in Matthew 24:29-31 and Mark 13:24-27 where He shows His return and gathering of the saints is AFTER... the tribulation. One cannot get any more straightforward than that.
God allows men's leaven false doctrines to deceive IF... the believer allows theirself to be deceived. It's no big mystery, as God allowed false ones to creep in among Israel to try His people with. He does this to test YOU, to see if you will listen to Him in His Word, or to men's doctrines.