Tractate Menachot - Chapter 13 - Mishnah 8

[If he said,] “I take upon myself to offer an ox,” he must bring one with its drink-offerings to the value of a maneh. “A calf,” he must bring one with its drink-offerings to the value of five selas. “A ram,” he must bring one with its drink-offerings to the value of two selas. “A lamb,” he must bring one with its drink-offerings to the value of one sela. If he said “An ox valued at one maneh,” he must bring one worth a maneh apart from its drink-offerings. “A calf valued at five selas,” he must bring one worth five selas apart from its drink-offerings. “A ram valued at two selas,” he must bring one worth two selas apart from its drink-offerings. “A lamb valued at one sela,” he must bring one worth one sela apart from its drink-offerings. [If he said, “I take upon myself to offer] an ox valued at a maneh,” and he brought two together worth a maneh, he has not fulfilled his obligation, even if one was worth a maneh less one denar and the other also was worth a maneh less one denar. [If he said] “A black one” and he brought a white one, or “a white one” and he brought a black one, or “a large one” and he brought a small one, he has not fulfilled his obligation. [If he said] “a small one” and he brought a large one, he has fulfilled his obligation; Rabbi says: he has not fulfilled his obligation.