Genesis 9:4

With blood. This was a matter of indifference in itself, like the forbidden fruit. But God gave the prohibition, to keep people at a greater distance from imbruing their hands in the blood of others, which nevertheless we know some have drunk! He would also assert his dominion over all things; the blood or life of animals being reserved to be offered in sacrifice to him, instead of the life of man, Leviticus xvii. 11. Blood of brutes is gross and unwholesome. (Menochius) --- The apostles required this law to be observed by the first Christians, that the Jews might not be disgusted: but, after a competent time had been allowed them, the Church thought proper to alter this discipline. (St. Augustine, contra Faust. xxxii. 13.)