Isaiah 1 starts with the description of the sins of the Israelis and God’s immense displeasure at them. The sins are plenty but one verse sums them all.
Ah sinful nation, a people laden with iniquity, a seed of evildoers, children that are corrupters: they have forsaken the LORD, they have provoked the Holy One of Israel unto anger, they are gone away backward. Isaiah 1:4
The chapter then goes on to prophesize that the land of the Israelis would be besieged.
Your country is desolate, your cities are burned with fire: your land, strangers devour it in your presence, and it is desolate, as overthrown by strangers. And the daughter of Zion is left as a cottage in a vineyard, as a lodge in a garden of cucumbers, as a besieged city. Isaiah 1:7-8
From history, we know that the captors mentioned here are the Romans. Later, it is mentioned that if the Israelis rid themselves from sins, they would regain their glory and would enjoy the bounties of their land.
If ye be willing and obedient, ye shall eat the good of the land: Isaiah 1:19
And I will restore thy judges as at the first, and thy counsellors as at the beginning: afterward thou shalt be called, The city of righteousness, the faithful city.Isaiah 1:26
The above mentioned verse states that their land would come back to the believers. When the second Caliph of Islam conquered Jerusalem, thousands of Jews embraced Islam and took high and important positions in the government.
Zion shall be redeemed with judgment, and her converts with righteousness.Isaiah 1:27
The above-mentioned verse states that the sinful Israelis would get their glory back. The Romans used to oppress the citizens and rule them with an iron fist. The Muslims took back the city and thousands of Jews returned to their land to live peacefully with the Muslims. The verse also states that the Israelis would be converts. Please note that the word for ‘converts’ used by other translations is ‘repentant’ and ‘ones who return’. All the words explain the same thing. The Israelis were following the religion of God in a distorted manner and they would repent, return and convert to Islam.
And the destruction of the transgressors and of the sinners shall be together, and they that forsake the LORD shall be consumed.Isaiah 1:28
This is one of the most important verses in this chapter. It says that the sinners and transgressors, who would have forsaken the Lord (Romans, who were Christians!) would be defeated. History confirms this fact and Prophet Isaiah (peace be upon him) considers the Christians as transgressors, sinners and ones who have forsaken the Lord by considering a human being as their Lord.
The Jews and Christians must follow the orders of God and in this case, the prophecy of Prophet Isaiah (peace be upon him) and return to the true religion of God Almighty, i.e. Islam.