A truth concerning Jesus and His ancestral lineage as the "Son of Man".......descendant of Adam the first man.
To David (king) was made the promise that his lineage (ancestral line) would remain the throne of Israel (2 Sam.7:12, Ps. 89:3-4, Jer. 23:5)
Its very important to note that Jesus was in line to sit on David's throne via his legal physical lineage (ancestral line). In the Gospel of Matthew the line of "Blessing" from God was traced. Line of Blessing does not always fall upon the 1st born in line.....precendent has been established where the 4th son was given the Blessing of God to be 1st in line. (Gen. 49:10).
The other Son's were rejected by God for various reasons and sins......for instance "Ruben" was skipped over for sleeping with his father's concubine (Gen. 49:4) The other 2 sons were skipped over because of their anger and violent temperments (Gen.49:5-7)......in other words God's always gives reason why ceratin Sons in line for kingship are skipped over......
As far as Jesus was concerned......He was in line to sit on David's via both His lines of heritage of Josesph........Jesus' legal father through adoption, under Jewish law adopted son's have the same legal rights as natural birth sons....and through Mary's physical lineage....where the line of Mary's father was considered.
But the scripture's point out that Jesus is made non-eligible to sit on David's throne physically because of a promise made from God. The last king of Israel to sit on David's throne "Jerconiah" was so wicked that God made a promise one of his descendants would be allowed to sit on David's throne (Jer. 22:24-30)
Jesus Legal Line goes through Jeconiah, but His physical line goes through another descendant (Luke 1:32-33). It is only through legal adoption that Jesus is qualified to sit on David's throne........and that is through being made Lord and Christ (king) of a Spiritual Kingdom, not a physcial kingdom.........to sit on David's throne in heaven, not on earth. Just as described in Acts 2: 14-47.........Peter begins by declaring.......this the prophecy of Joel coming true.........AND IT SHALL COME TO PASS IN "THE LAST DAYS"....(Acts 2:17)
Clearly, we as Christians have been living in the LAST DAYS of mankind since Jesus' ascension into Heaven....the last days are not some magical fable awaiting tribulation in the some imgained FUTURE reign of Jesus........we have been living in tribulation for the Name of Jesus for over 2000 years now. (Matthew 10:22-24), "And ye shall be hated of all men for My Names Sake; but he that endureth to the end shall be saved........" We all live in tribulation of this world, thus were are called out from the world to remain loyal to Christ Jesus.
The new Christians fled Jerusalem for Pella in 66 AD and avoided the tribulation.