But we do not wish you to be ignorant, brethren, concerning them that are fallen asleep, to the end that ye be not grieved even as also the rest who have no hope. For if we believe that Jesus has died and has risen again, so also God will bring with him those who have fallen asleep through Jesus. (For this we say to you in [the] word of [the] Lord, that we, the living, who remain to the coming of the Lord, are in no way to anticipate those who have fallen asleep; for the Lord himself, with an assembling shout, with archangel’s voice and with trump of God, shall descend from heaven; and the dead in Christ shall rise first; then we, the living who remain, shall be caught up together with them in [the] clouds, to meet the Lord in [the] air; and thus we shall be always with [the] Lord. So encourage one another with these words.) -1 Thes. 4:13-18 (DARBY)
The Rapture is one of those subjects that is always sure to solicit varied opinion among believers — sometimes hotly contested, at that. Many believe it will come before the Tribulation (I am in that camp) while others believe after and some even during.
I have considered different opinions over the years as to the timing of the Rapture (popular term given to it by theologians years ago). What matters most is that He will come again — and we know not when!