Reference for Berakhot 64:4
א"ר יוחנן כל כהן שהרג את הנפש לא ישא את כפיו שנא' (ישעיהו א, טו) ידיכם דמים מלאו:
R. Johanan said : A Kohen who has committed murder must not lift up his hands; as it is said, "Your hands are full of blood" (ibid.).
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