Isaiah 51:
1 Hearken to Me, you pursuers of righteousness, you seekers of the Lord; look at the rock whence you were hewn and at the hole of the pit whence you were dug.
2 Look at Abraham your father and at Sarah who bore you, for when he was but one I called him, and I blessed him and made him many.
3 For the Lord shall console Zion, He shall console all its ruins, and He shall make its desert like a paradise and its wasteland like the garden of the Lord; joy and happiness shall be found therein, thanksgiving and a voice of song.
4 Hearken to Me, My people, and My nation, bend your ears to Me, when Torah shall emanate from Me, and My judgment [shall be] for the light of the peoples, I will give [them] rest.
5 My righteousness is near, My salvation has gone forth, and My arms shall chasten peoples; islands shall wait for Me, and on My arm shall they trust.
6 Raise your eyes to heaven and look at the earth from beneath, for the heavens shall vanish like smoke, and the earth shall rot away like a garment, and its inhabitants shall likewise die, and My salvation shall be forever, and My righteousness shall not be abolished.
7 Hearken to Me, you who know righteousness, a people that has My Torah in their heart, fear not reproach of man, and from their revilings be not dismayed.
8 For, like a garment, the moth shall consume them, and like wool, the worm shall consume them, but My righteousness shall be forever, and My salvation to all generations.
9 Awaken, awaken, dress yourself with strength, O arm of the Lord, awaken, awaken like days of old, generations of yore; are you not the one that hewed Rahab and slew the sea monster?
10 Are you not the one who dried up the sea, the waters of the great deep? Who made the depths of the sea a road for the redeemed ones to pass?
11 And the redeemed of the Lord shall return, and they shall come to Zion with song, and [with] everlasting joy on their heads; gladness and joy shall overtake them; sorrow and sighing shall flee.
12 I, yea I am He Who consoles you; who are you that you fear man who will die and the son of man, who shall be made [as] grass?
13 And you forgot the Lord your Maker, Who spread out the heavens and founded the earth, and you fear constantly the whole day because of the wrath of the oppressor when he prepared to destroy. Now where is the wrath of the oppressor?
14 What must be poured out hastened to be opened, and he shall not die of destruction, and his bread shall not be wanting.
15 I am the Lord your God, Who wrinkles the sea and its waves stir; the Lord of Hosts is His name.
16 And I placed My words into your mouth, and with the shadow of My hand I covered you, to plant the heavens and to found the earth and to say to Zion [that] you are My people.
17 Awaken, awaken, arise, Jerusalem, for you have drunk from the hand of the Lord the cup of His wrath; the dregs of the cup of weakness you have drained.
18 She has no guide out of all the sons she bore, and she has no one who takes her by the hand out of all the sons she raised.
19 These two things have befallen you; who will lament for you? Plunder and destruction, and famine and sword. [With] whom will I console you?
20 Your sons have fainted, they lie at the entrance of all streets like a wild ox in a net, full of the wrath of the Lord, the rebuke of your God.
21 Therefore, hearken now to this, you poor one, and who is drunk but not from wine.
22 So said your Master, the Lord, and your God Who shall judge His people, "Behold, I took from you the cup of weakness; the dregs of the cup of My wrath-you shall no longer continue to drink it.
23 And I will place it into the hand of those who cause you to wander, who said to your soul, 'Bend down and let us cross,' and you made your body like the earth and like the street for those who cross."
Isaiah 52:
1 Who would have believed our report, and to whom was the arm of the Lord revealed?
2 And he came up like a sapling before it, and like a root from dry ground, he had neither form nor comeliness; and we saw him that he had no appearance. Now shall we desire him?
3 Despised and rejected by men, a man of pains and accustomed to illness, and as one who hides his face from us, despised and we held him of no account.
4 Indeed, he bore our illnesses, and our pains-he carried them, yet we accounted him as plagued, smitten by God and oppressed.
5 But he was pained because of our transgressions, crushed because of our iniquities; the chastisement of our welfare was upon him, and with his wound we were healed.
6 We all went astray like sheep, we have turned, each one on his way, and the Lord accepted his prayers for the iniquity of all of us.
7 He was oppressed, and he was afflicted, yet he would not open his mouth; like a lamb to the slaughter he would be brought, and like a ewe that is mute before her shearers, and he would not open his mouth.
8 From imprisonment and from judgment he is taken, and his generation who shall tell? For he was cut off from the land of the living; because of the transgression of my people, a plague befell them.
9 And he gave his grave to the wicked, and to the wealthy with his kinds of death, because he committed no violence, and there was no deceit in his mouth.
10 And the Lord wished to crush him, He made him ill; if his soul makes itself restitution, he shall see children, he shall prolong his days, and God's purpose shall prosper in his hand.
11 From the toil of his soul he would see, he would be satisfied; with his knowledge My servant would vindicate the just for many, and their iniquities he would bear.
12 Therefore, I will allot him a portion in public, and with the strong he shall share plunder, because he poured out his soul to death, and with transgressors he was counted; and he bore the sin of many, and interceded for the transgressors.
Isaiah 53:
1 Who would have believed our report, and to whom was the arm of the Lord revealed?
2 And he came up like a sapling before it, and like a root from dry ground, he had neither form nor comeliness; and we saw him that he had no appearance. Now shall we desire him?
3 Despised and rejected by men, a man of pains and accustomed to illness, and as one who hides his face from us, despised and we held him of no account.
4 Indeed, he bore our illnesses, and our pains-he carried them, yet we accounted him as plagued, smitten by God and oppressed.
5 But he was pained because of our transgressions, crushed because of our iniquities; the chastisement of our welfare was upon him, and with his wound we were healed.
6 We all went astray like sheep, we have turned, each one on his way, and the Lord accepted his prayers for the iniquity of all of us.
7 He was oppressed, and he was afflicted, yet he would not open his mouth; like a lamb to the slaughter he would be brought, and like a ewe that is mute before her shearers, and he would not open his mouth.
8 From imprisonment and from judgment he is taken, and his generation who shall tell? For he was cut off from the land of the living; because of the transgression of my people, a plague befell them.
9 And he gave his grave to the wicked, and to the wealthy with his kinds of death, because he committed no violence, and there was no deceit in his mouth.
10 And the Lord wished to crush him, He made him ill; if his soul makes itself restitution, he shall see children, he shall prolong his days, and God's purpose shall prosper in his hand.
11 From the toil of his soul he would see, he would be satisfied; with his knowledge My servant would vindicate the just for many, and their iniquities he would bear.
12 Therefore, I will allot him a portion in public, and with the strong he shall share plunder, because he poured out his soul to death, and with transgressors he was counted; and he bore the sin of many, and interceded for the transgressors.
G-d has many times in the Tanakh referred to Israel in the singular, including in Isaiah when he talks to Zion (Israel). What reason do I have to believe it does not mean what the plain text seems to say?