Make an uproar, O ye peoples, and be broken in pieces; and give ear, all ye of far countries: gird yourselves, and be broken in pieces; gird yourselves, and be broken in pieces. 10 Take counsel together, and it shall be brought to nought; speak the word, and it shall not stand: for God is with us.
Isaiah 8:9-10
Verse 10 literally reads: and it shall not stand because of Immanuel. The real impact of what's being said here gets lost because of the translation of the meaning of the name God with us rather than Immanuel. What this is saying is that God will preserve the house of David because of the Covenant God made with David of an eternal dynasty. Because of the AD 70 destruction of the Jewish temple all of the genealogical records have been lost so it would be impossible to trace the Davidic line after AD 70.
This passage teaches that Messiah must come before the 70 AD destruction of the temple.
6 For unto us a child is born, unto us a son is given; and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, Mighty God, Everlasting Father, Prince of Peace. 7 Of the increase of his government and of peace there shall be no end, upon the throne of David, and upon his kingdom, to establish it, and to uphold it with justice and with righteousness from henceforth even for ever. The zeal of Jehovah of hosts will perform this.
Isaiah 9:6-7
This passage teaches that
Messiah will be king
Messiah will be God and Man
Messiah must come before AD 70 to fulfill the Davidic Covenant and because of the destruction of the Temple.