A sacrifice is an object or animal dedicated or offered to God, after this dedication the object becomes God’s property, in the Old Testament animal offered as sacrifice are slaughtered on an altar but we thank God for the ultimate sacrifice of Jesus on the cross of calvary after which no killing of bulls and rams are required.
The only sacrifice required of us as a believer is to live our life as a living sacrifice (Rom.12v1) in this instance we are to dedicate and consecrate our life to God and not be conformed to the world. (Rom 12 v2).
God is looking for people to walk and work with him in this regard will He find you? John 4v23-24