'Blood' in the Bible

So Jesus told them, "Truly, I tell all of you emphatically, unless you eat the flesh of the Son of Man and drink his blood, you don't have life in yourselves.

Whoever eats my flesh and drinks my blood has eternal life, and I'll raise him to life on the last day,

because my flesh is real food, and my blood is real drink.

The person who eats my flesh and drinks my blood remains in me, and I in him.

Instead, one of the soldiers pierced his side with a spear, and blood and water immediately came out.