Reference for Zevachim 98:15

דבר הלמד בהיקש אין חוזר ומלמד מהיקש אי מדרבא אי מדרבינא דבר הלמד בהיקש מהו שילמד בגזירה שוה

Therefore [Scripture] wrote it<span class="x" onmousemove="('comment',' In the passage dealing with the anointed priest.');">²⁵</span> and assimilated it, in order to teach that that which is learnt through a hekkesh does not in turn teach through a hekkesh.

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