[If] one became tamei in the Courtyard, and the tumah escaped his memory, though he remembered the Temple; [or, the fact that it was] the Temple escaped his memory, though he remembered the tumah; [or] both escaped his memory, and he prostrated himself, or stayed long enough to prostrate himself, [or if] he went out by a longer way —- he is liable; by the shortest way —- he is exempt. This is the positive commandment concerning the Temple, for which there is no liability.

Now what is the positive commandment concerning the menstruant, for which there is liability? [If] one was cohabiting with a woman who was tahor, and she said to him, “I have become tamei,” and he withdrew immediately —- he is liable, because his exit is as pleasurable to him as his entry.

R' Eliezer says: A sheretz . . . and it escaped his awareness (Lev. 5:2) —- he is liable for forgetting the sheretz, but he is not liable for forgetting the Temple. R' Akiva says: And it escaped his awareness, and he was tamei (ibid.) —- he is liable for forgetting the tumah, but he is not liable for forgetting the Temple. R' Yishmael says: [The words] And it escaped his awareness, and it escaped his awareness (Lev. 5:23) [are stated] twice —- to make [one] liable both for forgetting the tumah and for forgetting the Temple.

Oaths are of two [types], which are [in reality] four: “I swear that I will eat,” or “[I swear] that I will not eat”; “[I swear] that I ate,” or “[I swear] that I did not eat.'' [If he said,] “I swear that I will not eat,” and he ate a minute quantity —- he is liable; [these are] the words of R' Akiva. They said to R' Akiva: Where do we find that one who eats a minute quantity is liable, that this one should be liable? R' Akiva said to them: Where do we find one speaking and bringing a sacrifice, that this one speaks and brings a sacrifice? “I swear that I will not eat,” and he ate and drank —- he is liable only once. [But if he said,] “I swear that I will not eat and that I will not drink,” and he ate and drank —- he is liable twice.