Reference for Chullin 47:30

ת"ל

Now I might also have argued [by an a fortiori argument] that priests are disqualified by age too; thus, if Levites who are not disqualified by bodily blemish are nevertheless disqualified by age, priests who are disqualified by bodily blemish should surely be disqualified by age! It is therefore written: 'Which pertaineth unto the Levites', and not 'unto the priests'.

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