Related for Keritot 34:41
יש אם למסורת מצות כתיב
If [the stain] was found on his [cloth]<span class="x" onmousemove="('comment',' Both husband and wife are recommended to use a piece of cloth after coitus to ascertain whether she was indeed in a condition of cleanness. Connection with a menstruant woman is subject to kareth in case of wilfulness and to a sin-offering in case of error. xuh,ut');"><sup>26</sup></span>
Tosefta Bikkurim
A k'vi (see Bikkurim 2:8) -- how is it like a wild animal? Its blood requires covering like a wild animal. Rabbi Eliezer says, they are liable to bring a variable guilt-offering for [partaking in] their [forbidden] fats. How is it like both a wild animal and a domesticated animal? One who flays (המפשיט not מפסיד, see GR"A) it, [the laws regarding whether its hide is] connected [to its flesh is] like wild animals and domesticated animals (see Tos. Chullin 8:6). And [the laws of] the sciatic nerve apply to it, like they do to wild animals and domesticated animals. If he said, "Behold, I will become a nazirite if [the k'vi] is [neither] a wild animal or a domesticated animal," behold, he has become a nazirite. Rabbi Yosei says, a k'vi is a unique creation unto itself, and the Sages were unable to render a decision about it, if it it is a wild animal or a domesticated animal.
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