Any doubtful nega is regarded as clean, except this case and one other. Which is that? If he had a bright spot of the size of a split bean and he was isolated, and by the end of the week it was as big as a sela, and it is doubtful whether it is the original one or whether another came in its place, he must be regarded as unclean.

If one had been certified unclean on account of white hair, and the white hair disappeared and other white hair appeared, And so also in the case of quick flesh or a spreading, Whether this occurred in the beginning, at the end of the first week, at the end of the second week, or after he had been released from uncleanness, he is regarded as being in the same position as before. If he had been certified unclean on account of quick flesh, and the quick flesh disappeared and other quick flesh appeared, And so also in the case of white hair and spreading, Whether this occurred in the beginning, at the end of the first week, at the end of the second week, or after the man had been released from uncleanness, he is regarded as being in the same position as before. If he had been certified unclean on account of a spreading, and the spreading disappeared and another spreading appeared, And so also in the case of white hair, Whether this occurred at the end of the first week, at the end of the second week, or after the man had been released from uncleanness, he is in the same position as before.

Deposited hair: Akaviah ben Mahalalel holds it is unclean. But the sages hold it to be clean. What is "deposited hair"? If one had a bright spot with white hair in it, and the bright spot disappeared leaving the white hair in position and then it reappeared: Akaviah ben Mahalalel holds it to be unclean, But the sages hold it to be clean. Rabbi Akiva said: in this case I agree that he is clean; But what is "deposited hair"? If one had a bright spot of the size of a split bean with two hairs in it, and a part the size of a half a split bean disappeared leaving the white hair in the place of the white spot and then it reappeared. They said to him: just as they rejected the ruling of Akaviah so is there no validity in your ruling.

Any doubt in negaim in the beginning is regarded as clean before uncleanness has been established, but after uncleanness has been established a doubt is regarded as unclean. How is this so? If two men came to a priest one having a bright spot the size of a split bean and the other having one of the size of a sela, and at the end of the week each had one the size of a sela, and it is not known on which of them the spreading had occurred, Whether this occurred with one man or with two men, each is clean. Rabbi Akiva said: if one man is involved he is unclean, but if two men are involved each is clean.

"But after uncleanness has been established a doubt is regarded as unclean." How so? If two men came to a priest, one having a bright spot of the size of a split bean and the other having one of the size of a sela and at the end of the week each was of the size of a sela and a little more, both are unclean; And even though both returned to be the size of a sela both are unclean, and remain unclean until they return to the size of a split split bean. They is what they meant when they said, "but after uncleanness has been established a doubt is regarded as unclean."