Here are some verses from the Hebrew Scriptures. They explain that G-d is not a human,that human sacrifice is an abomination and that one does not need blood to cleanse their sins. One goes to G-d for forgiveness. It is that simple.
Isaiah 44:6
Exodus 20:3
Deuteronomy 12:30-31,24:16
Malachi 3:6
Jonah 3:10
ALL of Leviticus 17
Numbers 14:20,16:47,23:19,31:50
Jeremiah 7:22-23
Hosea 11:9
Psalm 106:37-38