19 It was the precious blood of Christ, the sinless, spotless Lamb of God. – 1 Peter 1:19 NLT
There is nothing that we can offer to God that is acceptable for our redemption. Before the creation of the world, the price for our salvation was agreed upon by the Trinity. Nothing less than a sacrificial Lamb without blemish would be acceptable. In the Old Testament, the lamb had to be sacrificed over and over. In the New Testament, the perfect Lamb is sacrificed once for all sins of all times, past, present and future.
25 Nor did he enter heaven to offer himself again and again, the way the high priest enters the Most Holy Place every year with blood that is not his own. 26 Otherwise Christ would have had to suffer many times since the creation of the world. But he has appeared once for all at the culmination of the ages to do away with sin by the sacrifice of himself.— Hebrews 9:25-26 NIV
His work is finished. We, as Christians, have a work to do that will not be finished until the end of this age. We are foreigners, aliens and ambassadors here on earth. Our work is to spread the Good News that Jesus Christ has died and rose again to seal our redemption.