When God first allowed humans to consume flesh, God clarified that the same principle He decreed concerning blood would not just apply to animal blood, but to human blood as well...with even stronger force:
God said: "Besides that, your blood of your souls shall I ask back. . . . Anyone shedding man’s blood, by man will his own blood be shed, for in God’s image he made man." (Genesis 9:5, 6) If animal blood (representing animal life) was of sacred significance to God, obviously human blood had a sacred significance of even greater value.
To eliminate any doubt, God’s law prohibited consuming "any sort of blood," "the blood of any sort of flesh." (Leviticus 17:10, 14)
Tertullian (c. 160-230 C.E.) wrote: "The interdict upon ‘blood’ we shall understand to be (an interdict) much more upon human blood."—The Ante-Nicene Fathers, Vol. IV, p. 86.
