Reference for Chullin 178:29

על כזית מן המת מגלח על כולו לא כל שכן

By reason of uncleanness contracted from the following sources the Nazirite must shave [his head]:<span class="x" onmousemove="('comment',' If he was rendered unclean during the continuance of the Nazirite vow. Cf. Num. VI, 9ff.');">¹⁶</span>

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