If your language has a word for killing an animal for a sacrifice, consider using it here.
# with your blood
Since blood represents a person's life, losing the blood represents dying. This probably means "by your death" or "by dying." (See: [[rc://en/ta/man/translate/figs-metonymy]])
# you purchased people for God
"you bought people so that they could belong to God" or "you paid the price so that people could belong to God"