[If] one of the bloods was thrown on her behalf, he cannot revoke. R” Akiva says: Even if one of all the animals was slaugh- tered on her behalf, he cannot revoke. In what [context] are these things said? Concerning the head-shaving in taharah. But in the case of head-shaving for tumah, he may revoke, since he may say: I do not want an impoverished woman.” Rabbi says: Even concerning the head-shaving in taharah he may revoke, since he may say: “I do not want a shorn woman.”