Matthew 24:30-31 KJV
30) And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31) And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Matthew 25:31-33 KJV
31) When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
32) And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
33) And he shall set the sheep on his right hand, but the goats on the left.
These are two gatherings, of two different groups, at two different times, with two different outcomes. Both are prophesied in the OT.
Ezekiel 36:24-28 KJV
24) For I will take you from among the heathen, and gather you out of all countries, and will bring you into your own land.
25) Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
26) A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
27) And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
28) And ye shall dwell in the land that I gave to your fathers; and ye shall be my people, and I will be your God.
Ezekiel 39:25-29 KJV
25) Therefore thus saith the Lord GOD; Now will I bring again the captivity of Jacob, and have mercy upon the whole house of Israel, and will be jealous for my holy name;
26) After that they have borne their shame, and all their trespasses whereby they have trespassed against me, when they dwelt safely in their land, and none made them afraid.
27) When I have brought them again from the people, and gathered them out of their enemies' lands, and am sanctified in them in the sight of many nations;
28) Then shall they know that I am the LORD their God, which caused them to be led into captivity among the heathen: but I have gathered them unto their own land, and have left none of them any more there.
29) Neither will I hide my face any more from them: for I have poured out my spirit upon the house of Israel, saith the Lord GOD.
Zechariah 13:8-9 KJV
8) And it shall come to pass, that in all the land, saith the LORD, two parts therein shall be cut off and die; but the third shall be left therein.
9) And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.
Isaiah 11:10-12 KJV
10) And in that day there shall be a root of Jesse, which shall stand for an ensign of the people; to it shall the Gentiles seek: and his rest shall be glorious.
11) And it shall come to pass in that day, that the Lord shall set his hand again the second time to recover the remnant of his people, which shall be left, from Assyria, and from Egypt, and from Pathros, and from Cush, and from Elam, and from Shinar, and from Hamath, and from the islands of the sea.
12) And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four corners of the earth.
Joel 3:1-2 KJV
1) For, behold, in those days, and in that time, when I shall bring again the captivity of Judah and Jerusalem,
2) I will also gather all nations, and will bring them down into the valley of Jehoshaphat, and will plead with them there for my people and for my heritage Israel, whom they have scattered among the nations, and parted my land.
Much love!