<span class="x" onmousemove="Show('perush','Este es el <b>79no Precepto Positivo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">Santificarás al Señor, tu Dios, todo primogénito macho que nacerá</span>; de tus vacas y de tus ovejas: <span class="x" onmousemove="Show('perush','Este es el <b>113er Precepto Negativo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">no te sirvas del primogénito de tus vacas</span>, ni <span class="x" onmousemove="Show('perush','Este es el <b>114to Precepto Negativo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">trasquiles el primerizo de tus ovejas</span>.
Tosefta Bekhorot
There are things that are similar to blemishes and they may slaughter on their basis in the Temple, but they may not slaughter on their basis in the outlying areas, and they are these: The gomim, the tzomeach, the tzumam, and a female (n'keivah)*alt., "a female that has horns" (MS Vienna). What is a gomim? Anything that lacks horns. And a tzomeach is anything that lacks ears. A tzumam: One whose ears are closed up. Rabbi Ilai said in the name of Rabbi Yishmael: An androgynous: It is [considered a] first-born male, and its blemish is upon it, [and] it may be slaughtered on account of [that blemish]. And the Sages say, sanctity does not rest upon it [ab initio]; rather, it may go out and pasture with the flock. Rabbi Shimon says, behold, it says (Deut. 16:19), "Every first-born that is born among your herds or among your flocks, the male you shall consecrate to Hashem your God," so that in every place where it says "male," it excludes the tumtum and the androgynous from the general rule.