Reference for Menachot 54:4

והתניא גבי פרה שלא לשמן פסולות שלא מכוונות כשרות אמר רב חסדא ל"ק הא רבי יהודה הא רבנן

[Baraitha] states the view of R'Judah and the other that of the Rabbis. For it was taught: If a man that lacked atonement<span class="x" onmousemove="('comment',' A person who had duly immersed after his uncleanness, had awaited sunset, but had not yet brought the prescribed offerings. Such a person still retains a slight measure of uncleanness.');">⁶</span>

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