Who hath believed our report? and to whom is the arm of the LORD revealed?
The speaker, according to Horsley, personates the repenting Jews in the latter ages of the world coming over to the faith of the Redeemer: the whole is their penitent confession. This view suits the context (Isaiah 52:7-9), which is not to be fully realized until Israel is restored. Also the "we" and "our," in Isaiah 53:2-6, suit the penitent Jews. However, primarily, it is the abrupt exclamation of the prophet: "Who hath believed our report" (that of Isaiah and the other prophets) as to Messiah? The infidels' objection from the unbelief of the Jews is anticipated, and hereby answered: that unbelief and the cause of it (Messiah's humiliation, whereas they looked for One coming to reign) were foreseen and foretold.
Who hath believed our report? ( lishmu`aateenuw (H8052)) - literally, that which they have heard from us, repeating the term from the previous verse (Isaiah 52:15); whereas 'they who had not heard (the Gentiles) shall consider' 'who (of the Jews) have believed what they have heard from us;' referring to which sense Paul, quoting this verse, saith, "So, then, faith cometh by hearing" (Romans 10:16-17)
And to whom is the arm - power (Isaiah 40:10), exercised in miracles and in saving men (Romans 1:16; 1 Corinthians 1:18). The prophet, as if present during Messiah's ministry on earth, is deeply moved to see how few believed on Him (Isaiah 49:4; Mark 6:6; Mark 9:19; Acts 1:15). Two reasons are given why all ought to have believed:
(1) The "report" of the 'ancient prophets;'
(2) 'The arm of Yahweh' exhibited in Messiah while on earth. In Horsley's view this will be the penitent confession of the Jews, 'How few of our nation, in Messiah's days, believed in Him!'