Deuteronomy 14:21

Ye shall not eat of any thing that dieth of itself The blood being in it, rendered it unlawful to be eaten. Proselytes of the gate, not being obliged to observe these laws, or mere Gentiles, who might happen to be in their country, might eat such meat. But those who were termed proselytes of righteousness, that is, circumcised Gentiles, who had embraced the Jewish religion, were bound to abstain from such food as much as the native Jews.