“Whoever sheds human blood,
by humans shall their blood be shed;
for in the image of God
has God made mankind” (Genesis 9:6)
God’s renewed covenant with humanity, permits us to eat meat of other creatures (originally God wanted all creatures to live in Shalom with other creatures and not eat each other, but be vegetarians).
As long as we do not murder other humans, humans have the Divine presence in them, and killing another human being diminishes the image of God on earth.