Revelation 16:15

15    Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame

This is a parenthetical passage between the sixth and seventh vial that says that Jesus will come as a thief. Some think it is referring back to the time of the pre-tribulation rapture but I do not. Before the final battle takes place and while the Beast is gathering his forces, God will send his angels to gather all those who are looking for Him before the final vial is poured out. This seems to be the gathering spoken of in Matthew and Luke.

Matthew 24:40  Then shall two be in the field; the one shall be taken, and  the other left.

Matthew 24:41  Two women shall be grinding at the mill; the one shall be taken, and  the other left.

Luke 17:35  Two women shall be grinding together; the one shall be taken, and  the other left.

Luke 17:36  Two men shall be in the field; the one shall be taken, and  the other left.

These here have no white robes so it is not those seen in heaven who came out of the great tribulation (Revelation 7:14). They are wearing the garments of their good works and patience in the tribulation. Those said to be “ walking” naked probably either had no good works or stopped doing good works. Some will be ashamed before the rest of them but they will still go. This gathering may or may not include the natural descendants of Israel who did not take the mark. Perhaps at this point, some descendants of Israel in the world still do not know that Jesus is Jehovah. Whatever the case, Isaiah speaks of the return of natural Israel in the last days in the following passage:

Isaiah 11:16  And  there shall be an highway for the remnant of his people, which shall be left, from Assyria; like as it was to Israel in the day that he came up out of the land of Egypt.

2  Behold, God is my salvation; I will trust, and not be afraid: for the  LORD JEHOVAH  is my strength and my song; he also is become my salvation.

3  Therefore with joy shall ye draw water out of the wells of salvation.

4   And in that day shall ye say, Praise the LORD, call upon his name, declare his doings among the people, make mention that his name is exalted.

5  Sing unto the LORD; for he hath done excellent things: this is known in all the earth.

6   Cry out and shout, thou inhabitant of Zion:  for great is the Holy One of Israel  in the midst of thee.

Isaiah 35:8  And an highway shall be there, and a way, and it shall be called The way of holiness; the unclean shall not pass over it; but it shall be for those: the wayfaring men, though fools, shall not err therein.

9  No lion shall be there, nor any ravenous beast shall go up thereon, it shall not be found there; but the redeemed shall walk there:

10   And the ransomed of the LORD shall return, and come to Zion  with songs and everlasting joy upon their heads: they shall obtain joy and gladness, and sorrow and sighing shall flee away.