A guy named Paul taught the pretrib rapture hundreds of years before Darby.
Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. 1 Thess 4:17 (KJV)
Paul placed rapture at the second coming which comes after the great trib
1Th 4:13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
1Th 4:14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God
bring with him.
Context is the second coming.
1Th 4:15 For this we say unto you by the word of the Lord, that we which are alive and remain unto
the coming of the Lord shall not prevent them which are asleep.
Context is the second coming.
1Th 4:16 For
the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and
the dead in Christ shall rise first:
This is the second coming and the resurrection of the dead in Christ.
1Th 4:17 Then we which are alive and remain shall be
caught up (Harpazo) together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
This is the rapture and it happens after the second coming of Christ which only happens once the great tribulation has ended. The Greek word for rapture is harpazo and that's the term used by Paul in verse 17.