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To understand the connection between Keritot 6b and Yevamot 61, one must look at the laws regarding the and the specific holiness required of a High Priest. The Sanctity of the Anointing Oil (Keritot 6b)
The "best" (most definitive) source for this concept is often cited as Yebamot 61a keritot 6b page 78 jebhammoth 61 best