Thirty Righteous Goyim

 Chullin (92a) And a homer of barley and a half-homer of barley:’ these are the forty-five righteous men on account of whom the world continues to exist. But I know not whether thirty of them are here in Babylon and fifteen in the land of Israel, or thirty in the land of Israel and fifteen here in Babylon; but when the verse says. And I took the thirty pieces of silver and cast them into the treasury, in the house of the Lord, I know that thirty righteous men are in the land of Israel and fifteen here. Said Abaye: Most of them are to be found in the synagogue under the side chamber. And I said to them: If ye think good, give me my hire; and if not, forbear. So they weighed out for my hire thirty pieces of silver. Said Rab Judah: These are the thirty righteous non Jewish men among the nations of the world by whose virtue the nations of the world continue to exist. Ulla said: These are the thirty commandments which the sons of Noah took upon themselves but they observe three of them, namely, (i) they do not draw up a kethubah document for males,1 (ii) they do not weigh flesh of the dead in the market,2 and (iii) they respect the Torah.