if one did something for the sake of another purpose, it invalidated the cow. If a bird rested on the cow, it remained valid. If a bull mounted it, it became invalid; but Rabbi Judah ruled that if people brought the bull to mate with the cow, the cow became invalid, but if the bull did so on its own, the cow remained valid. If a cow had two black or white hairs growing within one follicle, it was invalid. Rabbi Judah said even within one hollow. If the hairs grew within two adjacent follicles, the cow was invalid. Rabbi Akiva ruled that even if there were four or even five non-red hairs, if they were dispersed, they could be plucked out. Rabbi Eliezer ruled that even as many as 50 such hairs could be plucked. But Rabbi Joshua ben Bathyra ruled that even if it had only one non-red hair on its head and one on its tail, it was invalid. If the cow had two hairs in one follicle with their roots black and their tips red or with their roots red and their tips black, Rabbi Meir taught that what was visible determined validity; but the Sages ruled that validity followed the root. Rav Judah reported in Samuel's name an account of the rarity of completely Red Cows: When they asked Rabbi Eliezer how far the honor due parents extended, Rabbi Eliezer told of a non-Jew from Ashkelon named Dama son of Nethinah. The Sages offered Dama a profit of 600,000 gold denarii (or Rav Kahana said 800,000 denarii) in exchange for jewels that he had that the Sages could use in the ephod, but as the key to the jewels lay under Dama's father's pillow, Dama declined the offer so as not to trouble his father. The next year, God rewarded Dama by causing a Red Cow to be born in his herd. When the Sages went to buy it, Dama told them that he knew that he could ask for all the money in the world and they would pay it, but he asked for only the money that he had lost in honoring his father. Rabbi Eliezer noted that both (with regard to burning the Yom Kippur sin offerings) and (with regard to slaughtering the Red Cow) say "outside the camp." Rabbi Eliezer concluded that both actions had to be conducted outside the three