Isaiah 63:19

“We are thine, &c.] Thy children, thy people, thy subjects. Some read it, taking a word from the next clause, “we are thine of old”, or “from everlasting”f1242; as the Lord’s special people are, being chosen by him in Christ before the foundation of the world, and taken into an everlasting covenant by him, when he became their God, and they his people; agreeably to which is the Targum, “we are thy people that were of old;” so Kimchi reads the words: “thou never barest rule over them”; the Heathens that oppressed them; they never acknowledged God as their King as they did, or were subject to him as they were; and therefore had no claim to protection from him as they had: they were not called…”

“thine . . . never--rather, "We are Thine from of old; Thou barest not rule over them" [BARNES]. LOWTH translates, "We for long have been as those over whom Thou hast not ruled, who are not called by Thy name"; "for long" thus stands in contrast to "but a little while" (Isa 63:18). But the analogy of Isa 63:18 makes it likely that the first clause in this verse refers to the Jews, and the second to their foes, as English Version and BARNES translate it. The Jews' foes are aliens who have unjustly intruded into the Lord's heritage. Next: Isaiah Chapter 64”

“We are thine - We urge it as a reason for thy interposition to restore the land and the temple, that we are thine from ancient times. Such I take to be the meaning of the passage - in accordance with the common translation, except that the expression מעולם mē‛ôlâm, ‘from ancient times,’ rendered by our translators in connection with לא lo', ‘never,’ is thus connected with the Jewish people, instead of being regarded as applied to their enemies. The idea is, that it is an argument why God should interpose in their behalf, that they had been for a long time his people, but that his foes, who then had possession of the land, had never submitted to his laws. There has been, however, great…”

“Thine - We continue so; we are in covenant, which they never were; and thus it is an argument they use with God to look upon them. Never - Not in that manner thou didst over us. They - Neither owned thee, nor were owned by thee. Next: Isaiah Chapter 64”

“63:19 Israel was constantly turning from God and then being punished by him.”

“are thine: Psa 79:6, Psa 135:4; Jer 10:25; Act 14:16; Rom 9:4; Eph 2:12 they were not called by thy name: or, thy name was not called upon them, Isa 65:1; Amo 9:12; Act 15:17 Next: Isaiah Chapter 64”