Is Isaiah 53 about Israel or about Jesus?

Isaiah 52:13–53:12

¹³Behold, my servant shall deal prudently, he shall be exalted and extolled, and be very high. ¹⁴As many were astonied at thee; his visage was so marred more than any man, and his form more than the sons of men: ¹⁵So shall he sprinkle many nations; the kings shall shut their mouths at him: for that which had not been told them shall they see; and that which they had not heard shall they consider. ¹Who hath believed our report? and to whom is the arm of the LORD revealed? ²For he shall grow up before him as a tender plant, and as a root out of a dry ground: he hath no form nor comeliness; and when we shall see him, there is no beauty that we should desire him. ³He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. ⁴Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted. ⁵But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. ⁶All we like sheep have gone astray; we have turned every one to his own way; and the LORD hath laid on him the iniquity of us all. ⁷He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. ⁸He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken. ⁹And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. ¹⁰Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand. ¹¹He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities. ¹²Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death: and he was numbered with the transgressors; and he bare the sin of many, and made intercession for the transgressors.

Acts 8:30–35

³⁰And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest? ³¹And he said, How can I, except some man should guide me? And he desired Philip that he would come up and sit with him. ³²The place of the scripture which he read was this, He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth: ³³In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth. ³⁴And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man? ³⁵Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus.