Reference for Chullin 66:9
דתניא
And here [in our Mishnah] it is a question of coming into contact, for it reads: AND MAY BE EATEN BY HIM WHOSE HANDS HAVE NOT BEEN WASHED, and this might very well mean that we are dealing with the case of one person feeding another?<span class="x" onmousemove="('comment',' Since the Mishnah does not say 'And one whose hands have not been washed may eat it', it is to be inferred that even a person with unwashed hands may feed another. And on the other hand, where the animal has been moistened by the blood, it may not be eaten by one whose hands are unwashed and similarly one with unwashed hands may not feed another. Hence the Mishnah forbids the touching of Second Tithe by one who is unclean in the second degree, which is contrary to all views.');"><sup>7</sup></span>