Psalms 40:3

And he hath put a new song in my mouth, [even] praise to our
God
Sung by him in the midst of the great congregation of angels and saints, upon his resurrection, ascension, and session at the right hand of God; see ( Psalms 22:22 Psalms 22:25 ) ; when he went to his God and ours, to his Father and ours; and in which song he is joined by all his people above and below, ( Revelation 5:9-13 ) ;

many shall see [it], and fear, and shall trust in the Lord;
even all the elect of God, as many as are ordained to eternal life; the many whose sins Christ bore, for whom he became a ransom, whom he justifies and brings to glory: these all "see" him in the horrible pit and miry clay, in his state of humiliation, as bearing their sins, and the punishment due unto them; as wounded, bruised, and crucified; as rising again for their justification; and as on Mount Zion crowned with glory and honour; and a multitude of harpers with him, singing the new song; these see the salvation he has wrought out, the glory, fulness, and suitableness of it, and their interest in it; and they "fear" not with a fear of hell and damnation, which is inconsistent with the trust after mentioned; but with a godly and filial fear, which arises from and is encouraged by the grace and goodness of God, their faith in the sufferings, death, and resurrection of Christ Jesus, and which render him a proper object of trust and confidence; for he is so both as suffering, crucified, and slain, and as risen again, and exalted at the Father's right hand, ( Galatians 2:20 ) ( 1 Peter 1:22 ) .