Psalm 35:9

And my soul shall be joyful in the LORD: it shall rejoice in his salvation.

And my soul shall be joyful in the Lord,.... Not in the destruction of his enemies, but in the God of his salvation; the Targum is, "in the Word of the Lord"; the essential Word of God, the promised Messiah, Saviour, and Redeemer. Christ is the object of a believer's joy; he rejoices in his person, as he is the mighty God, able to save him, and to keep what he has committed to him, and to preserve him from falling; as he is God and man in one person, and so fit to be a Mediator between God and man; and as he is a Prophet to instruct him, a Priest to expiate his sin and make intercession for him, and as a King to rule over, protect, and defend him; and as he stands in the relations of a father, husband, brother, and friend: he rejoices in what he has done and is doing; in that this Word is made flesh, and has obtained eternal redemption, and now appears in the presence of God, as an advocate and intercessor: it follows,

it shall rejoice in his salvation; that which Jehovah the Father has determined upon, provided for, and has formed the scheme of; that which Jehovah the Son undertook to accomplish, and now has finished; and that which Jehovah the Spirit had made a discovery and application of unto the psalmist, in answer to his request in Psalms 35:3. This filled him with so much joy, as it does every believer that has a view of interest in it; seeing hereby the law is fulfilled, justice is satisfied, sin is atoned for, the pardon of it is procured, an everlasting righteousness is brought in, and a solid foundation laid for hope of eternal glory and happiness.