Related for Bekhorot 61:42
ומעשרותיו דאי בעי שדי ביה מומא בכוליה עדריה
'He also allows himself to be asked with reference to his levitically prepared food', [the reason being] because they are fit to eat during the period of his uncleanness.<span class="x" onmousemove="('comment',' He is consequently not suspected of declaring something which is unclean to be clean, since he can make use even of unclean food. This of course only refers to hullin, but unclean terumah is not suitable for him to eat even when he is levitically unclean, as it requires to be burnt.');"><sup>24</sup></span>
Tosefta Demai
[With respect to one who] comes to take upon himself [the obligations of a chaver, see Minchat Yitzchak here], if he had always [lit. "from the beginning"] acted modestly, we accept him, and afterwards we teach him [the strictures applicable to the chaverim], and if not (i.e., if he had not always been modest), we teach him first, and afterwards we accept him. [Rabbi Shimon says, either way we accept him first and then we teach him (per the GR"A)], and we lead him (i.e., impart the halachot on him) like so: [First] we accept him regarding "wings" (the ritual washing of hands before eating, see Y. Dem. II.3.7), and after than we accept him regarding "purities" (eating ritually clean food, ibid.). And if [at that point] he said, "I don't take this (i.e., "purities") upon myself, but only "wings," we still accept him. If he takes upon himself "purities" but does not take upon himself "wings," then he is not [considered] trustworthy. How long until we accept him [as a chaver]? Beit Shammai say, 30 days as to [matters of impurity involving] liquids, 12 months as to [the impurity of] clothing. And Beit Hillel say, 30 days for both.
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