Mesorat%20hashas for Zevachim 135:4

בן עזאי אומר ב' חטאות

R'Joshua observed: This is the case where they [the Sages] said: When it is alive it has one voice, and when it is dead, it has seven voices!<span class="x" onmousemove="('comment',' If she gave the birds to the priest but does not know whether they were turtle-doves or pigeons, or a pair of each, and she does not know how the priest sacrificed them, whether all above or all below or half above and half below, perhaps she did not even fulfil her statutory obligation. For he may have sacrificed all above, so that she lacks a sin-offering; or all below, and she lacks a burnt-offering. She must then bring four birds for her vow, since she does not remember which of the two species she specified, and two for her statutory burnt-offering, viz., a turtle-dove and a pigeon, as possibly the first were all offered below, as sin-offerings, and now she requires a burnt-offering of the same species. Or perhaps the first were offered half above and half below, and she has fulfilled her obligation with the first pair offered. But as she had vowed to bring a burnt-offering at the same time and of the same species as the statutory burnt-offering, she must now bring a turtle-dove and a pigeon to cover this doubt. In addition, she must bring one sin-offering of whichever species she wishes, for perhaps the first were all offered below, and this will combine with the bird she brought as her burnt-offering. Though she has already brought the latter, yet the sin-offering need not be of the same species as the first, according to the Rabbis who disagree with Ben 'Azzai, for they hold that it all depends on the sin-offering. Therefore, since she must bring two burnt-offerings, as explained, that of the same species as the sin-offering combines with it. But Ben 'Azzai holds that it all depends on the first, i.e., a sin-offering must be brought of the same species as the first burnt-offering which was correctly offered for her statutory obligation. Now, perhaps all the first were offered above, in which case she has fulfilled this obligation, and so she must bring a sin-offering of the same species. As, however, she does not know which species this was, she must bring two sin-offerings, one of each. R. Joshua observes that this is similar to what the Rabbis said about a ram, that when it is alive it has one voice only, but when it is dead it has seven: i.e., the two horns are used for two trumpets (bugle-horns) ; out of the two legs two reed-pipes (flutes) are made; the skin is used for tabrets; the entrails for a lyre, and the guts for harps. In a similar way here too, when she vowed and did not know what she had specified, she merely required four birds and two for her statutory obligation. Whereas now that she has already brought four, she still needs another eight, four on account of her vow and four on account of her obligation; v. Kin. III, 6. - Since R. Joshua makes this comment, you may infer that he accepts these laws; hence the difficulty of 67b.');">²</span>

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