פּירוש אויף דברים 12:25

לא תאכלנו THOU SHALT NOT EAT IT — This is a prohibition against eating of the blood contained in the limbs (Keritot 4b).

that it may be good for you One should not incorporate the soul of a beast, and thereby adulterate one’s own soul. Since both the soul, and the form of the body, are formed in the image of the father, Scripture accordingly continues your children after you.

“Do not eat it, so that it may be well with you and your children after you.” Here, he specifically mentions your children after you because commentators have said that blood generates cruelty in the body of the one who eats it, and the nature of the father is also passed on to the children, and their offspring will be like them. Therefore, it says that when you do not eat blood, it will be well with you and your children after you, so that cruelty will not become a trait firmly embedded in your descendants. For this reason, it is mentioned nearby regarding the destruction of an idolatrous city [where] women and children [are killed] in a single day, which appears to be a great cruelty, and there is concern that cruelty might become a firmly embedded trait in him and his descendants. Therefore, it says, He will give you compassion, that you will be compassionate by nature, at least toward people, and because of this, God will have mercy on you. And this is what is meant by He will give you compassion and have mercy on you and multiply you — meaning that He will multiply your offspring, as they too will be compassionate like you.

למען ייטב לך וגו׳ THAT IT MAY BE WELL WITH THEE, etc. — Go and learn how great is the grant of reward for keeping the divine commandments: if in the case of blood for which the soul of man feels a loathing, he who keeps aloof from it obtains merit for himself and for his children after him, how much the more is it so in the case of robbery or forbidden sexual relations for which the soul of man may feel a longing (Makkot 23b).