isaiah 52:15 So 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. - Free Bible Online

      15. sprinkle many--GESENIUS, for the antithesis to "be astonished," translates, "shall cause . . . to exult." But the word universally in the Old Testament means either to sprinkle with blood, as the high priest makes an expiation (Le 4:6; 16:18, 19); or with water, to purify (Eze 36:25; compare as to the Spirit, Ac 2:33), both appropriate to Messiah (Joh 13:8; Heb 9:13, 14; 10:22; 12:24; 1Pe 1:2). The antithesis is sufficient without any forced rendering. Many were astonished; so many (not merely men, but) nations shall be sprinkled. They were amazed at such an abject person claiming to be Messiah; yet it is He who shall justify and purify. Men were dumb with the amazement of scorn at one marred more than the lowest of men, yet the highest: even kings (Isa 49:7, 23) shall be dumb with awe and veneration ("shut . . . mouths"; Job 29:9, 10; Mic 7:16).
      that . . . not . . . told them--the reason why kings shall so venerate them; the wonders of redemption, which had not been before told them, shall then be announced to them, wonders such as they had never heard or seen parallelled (Isa 55:1; Ro 15:21; 16:25, 26).

JFB.