The Covenant between God the Father and God the Son!
"I, the Most High Jehovah, do hereby give unto my only begotten and well-beloved Son, a people, countless beyond the number of stars, who shall be by him washed from sin, by him preserved, and kept, and led, and by him, at last, presented before my throne, without spot, or wrinkle, or any such thing. I covenant by oath, and swear by myself, because I can swear by no greater, that these whom I now give to Christ shall be for ever the objects of my eternal love. Them I will forgive through the merit of the blood. To these will I give a perfect righteousness; these will I adopt and make my sons and daughters, and these shall reign with me through Christ eternally." Thus run that glorious side of the covenant. The Holy Spirit also, as one of the high contracting parties on this side of the covenant, gave his declaration, "I hereby covenant," saith he, "that all whom the Father giveth to the Son, I will in due time quicken. I will show them their need of redemption; I will cut off from them all groundless hope, and destroy their refuges of lies. I will bring them to the blood of sprinkling; I will give them faith whereby this blood shall be applied to them, I will work in them every grace; I will keep their faith alive; I will cleanse them and drive out all depravity from them, and they shall be presented at last spotless and faultless."
This was the one side of the covenant, which is at this very day being fulfilled and scrupulously kept. As for the other side of the covenant this was the part of it, engaged and covenanted by Christ.
He thus declared, and covenanted with his Father: "My Father, on my part I covenant that in the fullness of time I will become man. I will take upon myself the form and nature of the fallen race. I will live in their wretched world, and for my people I will keep the law perfectly. I will work out a spotless righteousness, which shall be acceptable to the demands of thy just and holy law. In due time I will bear the sins of all my people. Thou shalt exact their debts on me; the chastisement of their peace I will endure, and by my stripes they shall be healed. My Father, I covenant and promise that I will be obedient unto death, even the death of the cross. I will magnify thy law, and make it honorable. I will suffer all they ought to have suffered. I will endure the curse of thy law, and all the vials of thy wrath shall be emptied and spent upon my head. I will then rise again; I will ascend into heaven; I will intercede for them at thy right hand; and I will make myself responsible for every one of them, that not one of those whom thou hast given me shall ever be lost, but I will bring all my sheep of whom, by thy blood, thou hast constituted me the shepherd—I will bring every one safe to thee at last."