Read Hebrews 10:5-10
5 For this reason, when Christ was about to come into the world, he said to God:
“You do not want sacrifices and offerings,
but you have prepared a body for me.
6You are not pleased with animals burnt whole on the altar
or with sacrifices to take away sins.
7Then I said, ‘Here I am,
to do your will, O God,
just as it is written of me in the book of the Law.’ ”
8First he said, “You neither want nor are you pleased with sacrifices and offerings or with animals burnt on the altar and the sacrifices to take away sins.” He said this even though all these sacrifices are offered according to the Law. 9Then he said, “Here I am, O God, to do your will.” So God does away with all the old sacrifices and puts the sacrifice of Christ in their place. 10Because Jesus Christ did what God wanted him to do, we are all purified from sin by the offering that he made of his own body once and for all.
The writer of Hebrews imagines Jesus having a conversation with the Father, interpreting Psalm 40:6-8... "Sacrifices and offerings you have not desired..."
Instead of a burnt offering; Jesus offers himself - the way he lives.
His offering makes the way for us to make our offerings; as we are sanctified - made holy to live holy lives.
Lord set me free to offer myself as a living sacrifice.