Rev 7:4 And I heard the number of them that were signed. A hundred and forty-four thousand were signed, of every tribe of the children of Israel.

Of the 12 tribes of Israel that are included in the 144,000, the tribe of Dan is omitted and replaced with Joseph's son Manasseh. Firstly, let us look at Genesis and where the birth names occur.

Genesis 29:32 Reuben: “surely the LORD hath looked upon my affliction; now, therefore, my husband will love me.”
Genesis 29:33 Simeon: “because the LORD hath heard, he hath therefore given me this son.”
Genesis 29:34 Levi: “now this time will my husband be joined unto me”
Genesis 29:35 Judah: “now will I praise the LORD”
Gen 30:6 Dan: “The Lord hath judged for me,”
Genesis 30:8 Naphtali: “with great wrestlings, I have prevailed.”
Genesis 30:11 Gad: “a fortune cometh”
Genesis 30:13 Asher: “happy am I, call me blessed”
Genesis 30:18 Issachar: “God hath given me my reward”
Genesis 30:20 Zebulun: “now will my Husband dwell with me”
Genesis 30:24 Joseph: “The LORD shall add to me”
Genesis 35:18 Benjamin: “the Son of the right hand”
Genesis 41:51 Manasseh: “for God hath made me forget all my toil.”

The meanings of these names as per Revelation 7 order:

Judah: Praise the Lord,
Reuben: See a Son
Gad: good fortune comes
Asher: happy and blessed am I
Napthali: my wrestling
Manasseh: has made me forget my toil
Simeon: God hears me
Levi: has joined me
Issachar: rewarded me
Zebulun: dwell with me
Joseph: adding to me
Benjamin: the Son of His right hand.

Revelation 7 placed these names in a different order to Genesis, not by birth, but to give a deeper meaning for the 144,000...

Praise the Lord, see the Son, good fortune comes, happy and blessed am I, my wrestling has made me forget my toil. God hears me, has joined me, rewarded me, dwells with me, adding to me the Son of His right hand.

The tribe of Dan was clearly left out, the meaning of Dan is "Judge".
Was Dan judged unworthy for their sins and idolatry, or will they be amongst the multitude?

Deu 29:18 lest there should be among you man, or woman, or family, or tribe, whose heart turneth away this day from the LORD our God, to go to serve the gods of those nations; lest there should be among you a root that beareth gall and wormwood;
Deu 29:19 and it come to pass, when he heareth the words of this curse, that he bless himself in his heart, saying: 'I shall have peace, though I walk in the stubbornness of my heart - that the watered be swept away with the dry';
Deu 29:20 the LORD will not be willing to pardon him, but then the anger of the LORD and His jealousy shall be kindled against that man, and all the curse that is written in this book shall lie upon him, and the LORD shall blot out his name from under heaven;
Deu 29:21 and the LORD shall separate him unto evil out of all the tribes of Israel, according to all the curses of the covenant that is written in this book of the law.

Jdg 18:30 And the children of Dan set up for themselves the graven image;

Amos 8:14 They that swear by the sin of Samaria, and say, Thy god, O Dan, liveth; and, The manner of Beersheba liveth; even they shall fall, and never rise up again.

A Great Multitude from Every Nation

Rev 7:9 After this, I saw a great multitude, which no man could number, of all nations and tribes and peoples and tongues, standing before the throne and in sight of the Lamb, clothed with white robes, and palms in their hands.
Rev 7:10 And they cried with a loud voice, saying: Salvation to our God, who sitteth upon the throne and to the Lamb.

More End Times Information:
https://godcoin.gold/
http://torah-codes.net/
http://www.ra-el.org/