Talmud for Moed Katan 34:19
אמר עולא הלכה כרבי יהודה באבל והלכה כרבי יוסי במועד שמואל אמר
of the festival offerings [on the altar] and sharing th 'shewbread'<span class="x" onmousemove="('comment',' Ibid. XXIV, 5-9.');"><sup>23</sup></span> - that we consider him as one whose Ward had virtually not yet completed [its turn].<span class="x" onmousemove="('comment',' Therefore he is not in the list of the Mishnah among those who may.');"><sup>24</sup></span> Whereas the external Tanna holds that although [in a way] he belongs to the other Wards [also], his own Ward had nevertheless [actually] completed [its turn, and therefore he may trim himself].<span class="x" onmousemove="('comment',' Cf. n. 1.');"><sup>25</sup></span> Our Rabbis taught: All those who were mentioned [in the Mishnah] as being allowed to crop their hair during the festival [week] are likewise allowed to crop their hair during the days of their mourning. But surely it is taught that they are forbidden? - Said R'Hisda as citing R'Shela: When it is taught here that they 'are allowed [to crop their hair during the days of their mourning]', it refers only to persons who suffered one bereavement immediately after another. If it refers only [as you say] to persons who suffered one bereavement immediately after another, what is the point in wording it 'all those who were mentioned [in the Mishnah]' whereas [under such unfortunate circumstances] it is even applicable to anybody, as it is taught: 'If a person suffered one bereavement immediately after another and his hair has become oppressively [long], he may ease it with a razor and wash his raiment with water'? - But that has already been explained: R'Hisda said [it means], ease it with a razor but not with scissors: wash his raiment with water but not natron or lye.<span class="x" onmousemove="('comment',' [In the case of those mentioned in the Mishnah, where they in addition suffered one bereavement after another, the said restrictions do not apply].');"><sup>26</sup></span> [Furthermore] said R'Hisda: This [Baraitha] indicates that [otherwise] a mourner is barred from washing [his clothes]. Our Rabbis taught: 'Just as it was said that cropping the hair during the festival [week] is not allowed, so is paring the nails during the festival [week] not allowed. This is R'Judah's opinion; but R'Jose allows it. And just as it was said that a mourner is not allowed to crop his hair within [the period of] his mourning, so is paring the nails not allowed to him within [the period of] his mourning. This is R'Judah's opinion; but R'Jose allows it 'Ulla stated that the halachah follows the view of R'Judah in the case of a mourner, and that of R'Jose in regard to the festival [week]. Samuel said