Well, I' am thinking about your answer, and pondering it very hard, and this is my short answer to you: There's no question that Jesus was the Lamb of God without spot or blemish, all would agree ~yet that is not even close of answering the question.
His shed blood of itself would have not been worthy, if indeed he was not without sin and pleased God perfectly in
thought, word and deed from conception to his death~so far, we are in agreement with the scriptures. But, that's not answering the question concerning his suretiship of his people. Please consider:
The DEFINITION
Surety.
A person who undertakes some specific responsibility on behalf of another who remains primarily liable; one who makes himself liable for the default or miscarriage of another, or for the performance of some act on his part (e.g. payment of a debt, appearance in court for trial, etc.).
We have surety bonds, performance bonds, bail, and bond to guarantee legal, financial, and professional obligations, such as with construction and insurance companies.
When we need to borrow more than our credit allows,
we appreciate a surety; if we were arrested for something, we would appreciate the surety bond that lets us go free.
Judah became a surety for Benjamin to his father Jacob (
Gen 43:8-10;
44:30-34;
42:37). Aaron became a surety for Israel in their sins and stood between them (
Num 16:41-48).
The SURETISHIP
Jesus, a High Priest after the order of Melchisedec, was made the Surety of His people. God chose Jesus from among the people to be the mighty Surety (
Psalm 89:19). He was made Surety by God’s oath at His ordination as our Priest (
Heb 7:21).
Jesus did the will of God perfectly
as our Surety for our salvation (
Heb 10:5-14). Being a surety
means paying debts and performing, where the needy cannot pay or do. The wages of sin is death, which God’s justice pays; but Jesus died (
Rom 6:23). Only the undefiled enter heaven, so He lived faultlessly for us (
Jude 1:24-25). Jesus was necessary as a surety, for the justice of God must surely be paid (
Rom 3:26). He is the Testator, for it was by His death that He put the covenant in force (
Heb 9:15). We see Him under the strain of t
he Surety engagement in Gethsemane (
Luke 22:39-44). No man in heaven or earth could approach the throne, but only our Surety (
Rev 5:1-14).
If this is not a Surety, successfully finishing His work,
what is it (
Isaiah 53:4-12)? The doctrine of representation by the Second Adam reveals our Surety (
Rom 5:15-19). The Lord Jesus tasted death for every one of His children to deliver them (
Heb 2:9-17).
How else can we look at the Book of Life, but
as the list of His Surety engagements!
The BENEFITS
The Lord Jesus fulfilled the righteousness of the law
on our behalf (
Rom 8:3-4), so that we are righteous in God’s sight
with His perfect obedience (
Eph 5:25-27;
Col 1:21-22). The Lord Jesus
paid the penalty for sins by His death for us (
I Pet 2:24), so that there are
no more sins against our charge when we stand before Him (
John 1:29;
Heb 9:28).
Not now, not ever! He lives to make sure we are absolutely, completely, and eternally saved (
Heb 7:25). There is an abundant entrance into heaven waiting for the children of God (2nd
Pet 1:11). Since Jesus is our Surety, it is impossible for God to withhold blessings (
Romans 8:32). His death reconciled us to God, but He still lives to be
an eternal Surety (
Romans 5:10).