Why the Torah Says Speak Twice to the Priests in Emor

(Lev. 21:1) "And the LORD said to Moses: Say to the priests." R. Yohanan said: Every place where it says "Say... and you shall say," it requires expounding. (Esth. 7:5) "And King Ahasuerus said, and he said to Queen Esther." Why "said... and said"? He said to her: If this one is the one, well and good; and if not, they have said that he is the one. R. Abin said: Before he recognized that she was a Jewess, he would speak with her by means of an interpreter; once he recognized her, he began to speak with her himself. Similarly: (1 Kings 20:28) "And a man of God drew near and said to (Ahab) the king of Israel, and he said: Thus says the LORD." Why "said... and said"? He said to him: When Ben-hadad falls into your hand, you shall not have pity on him. A second saying he said to him: Be aware how many snares and nets I spread out for him until he came into your hand; and now, (vs. 42) "if he is let go, then your life shall be for his life, and your people for his people." [Similarly] (Ezek. 10:2) "And he said to the man clothed in linen, and he said: Go in among the wheelwork." He said to the angel, and the angel said to the cherub. He said to him: The Holy One, blessed be He, has decreed upon me, but I have no permission to enter within your partition; rather, do a kindness with me and give me two coals. Immediately (vs. 7), "the man clothed in linen lifted up and put them into his hands." R. Pinhas said: He cooled them and gave them to him. R. Joshua of Sikhnin said in the name of R. Levi: Two coals were kept smoldering in the hand of Gabriel for two and a half years. He thought that Israel would repent. When they did not do so, he sought to hurl them and to destroy them utterly. The Holy One, blessed be He, said to him: Gabriel, do not do so; among them are people who do repentance and righteousness one with another, as it is said (vs. 8), "And there appeared in the cherubim the form of a man's hand." Therefore "said... and said." And here too: "Say to the priests, and you shall say"—the first saying is for the corpse of a mitzvah, that he may become impure for it; and the second, for others, that he shall not become impure.