Rashi on Deuteronomy 12:25/רש"י על דברים י״ב:כ״ה

1לא תאכלנו THOU SHALT NOT EAT IT — This is a prohibition against eating of the blood contained in the limbs (Keritot 4b).

2למען 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).