Emor, Section 1
1) (Vayikra 21:1) ("And the L–rd said to Moses, saying: Speak to the Cohanim, the sons of Aaron, and you shall say to them: For a dead body he shall not become tamei among his people." The sons of Aaron may not become tamei for a dead body; the daughters of Aaron may become tamei for a dead body. "the sons of Aaron": I might think that challalim (those of imperfect priestly status, are also included in the interdict); it is, therefore, written "Cohanim" — to exclude challalim. And whence is it derived that those with blemishes are included? From "the sons of Aaron." "the sons of Aaron": even the minors.