According to the Jewish book of Genesis (1:29-30), mankind, the beasts of the earth, the birds of the air, and all the creatures that moved on the ground----everything that had the breath of life in it----were "vegetarians".
Genesis 6-9 tells us about Noah, the Ark he built for his family and the "living creatures that had the breath of life in it", and the story of the FLOOD. When the ordeal was over, Noah sacrificed burnt offerings (meat) to praise his creator. God then told Noah and his sons to be fruitful and increase in number. He also told them that now they could also eat everything that "lived and moved". But, God said, You must not eat meat that has its "lifeblood" still in it. You must not eat the life with the meat. Pour it out on the ground like water (book of Deuteronomy 12:23). For the life of a creature (book of Leviticus 17:11-12 is in the blood. None of you may eat blood, nor may an alien living among you eat blood. f
That's why Jews and Muslims make sure that "lifeblood" returns to the soil.
The breath of life and lifeblood are considered "sacred".