Let us look at this verse:
"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" (Mt.24:30).
Notice that he says all tribes of the earth. Tribes refers to Israel.
Mat 19:28 And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory,
ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
Here Jesus tells his disciples that they will judge, with him, the twelve tribes of Israel.
Rom 3:19 Now we know that what things soever the law saith, it saith to them who are under the law: that every mouth may be stopped, and all the world may become guilty before God.
Rom 3:20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
Rom 3:21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
Rom 3:22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
Rom 3:23 For all have sinned, and come short of the glory of God;
Rom 3:24
Being justified freely by his grace through the redemption that is in Christ Jesus:
Rom 3:25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
Our sins have been remitted through God.
Rom 3:26 To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.
Rom 3:27 Where is boasting then? It is excluded. By what law? of works? Nay: but by the law of faith.
Rom 3:28
Therefore we conclude that a man is justified by faith without the deeds of the law.
Christians are justified by faith, not law.
Rev 20:12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and
the dead were judged out of those things which were written in the books, according to their works.
Those that are being judged are judged by their works, that would be the ones who lived under law, the twelve tribes of Israel.!