Blood is the required sacrifice that God commanded. Throughout the bible there are many kinds of blood sacrifice, different animals at different time for specific reasons.
BUT the only blood of any significance to a Christian is the Blood of Jesus Christ, the one perfect, final payment for the sins of all mankind that will repent and accept it as such.
Rom 3:23-26 for all have sinned and fall short of the glory of God, 24 being justified freely by His grace through the redemption that is in Christ Jesus, 25 whom God set forth as a propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed, 26 to demonstrate at the present time His righteousness, that He might be just and the justifier of the one who has faith in Jesus.
Rom 5:8-9 in that while we were still sinners, Christ died for us. 9 Much more then, having now been justified by His blood, we shall be saved from wrath through Him.
Col 1:13-14 He has delivered us from the power of darkness and conveyed us into the kingdom of the Son of His love, 14 in whom we have redemption through His blood, the forgiveness of sins.