13. I will put my trust in him--from the Septuagint, Isa 8:17, which immediately precedes the next quotation, "Behold, I and the children," &c. The only objection is the following words, "and again," usually introduce a new quotation, whereas these two are parts of one and the same passage. However, this objection is not valid, as the two clauses express distinct ideas; "I will put my trust in Him" expresses His filial confidence in God as His Father, to whom He flees from His sufferings, and is not disappointed; which His believing brethren imitate, trusting solely in the Father through Christ, and not in their own merits. "Christ exhibited this "trust," not for Himself, for He and the Father are one, but for His own people" (Heb 2:16). Each fresh aid given Him assured Him, as it does them, of aid for the future, until the complete victory was obtained over death and hell Php 1:16 [BENGEL].
      Behold I and the children, &c.-- (Isa 8:18). "Sons" (Heb 2:10), "brethren" (Heb 2:12), and "children," imply His right and property in them from everlasting. He speaks of them as "children" of God, though not yet in being, yet considered as such in His purpose, and presents them before God the Father, who has given Him them, to be glorified with Himself. Isaiah (meaning "salvation of Jehovah") typically represented Messiah, who is at once Father and Son, Isaiah and Immanuel (Isa 9:6). He expresses his resolve to rely, he and his children, not like Ahaz and the Jews on the Assyrian king, against the confederacy of Pekah of Israel, and Rezin of Syria, but on Jehovah; and then foretells the deliverance of Judah by God, in language which finds its antitypical full realization only in the far greater deliverance wrought by Messiah. Christ, the antitypical Prophet, similarly, instead of the human confidences of His age, Himself, and with Him GOD THE FATHER'S children (who are therefore His children, and so antitypical to Isaiah's children, though here regarded as His "brethren," compare Isa 9:6; "Father" and "His seed," Isa 53:10) led by Him, trust wholly in God for salvation. The official words and acts of all the prophets find their antitype in the Great Prophet (Re 19:10), just as His kingly office is antitypical to that of the theocratic kings; and His priestly office to the types and rites of the Aaronic priesthood.

JFB.