Deuteronomy 33:9-10

9 He said to his father and mother, “I have not seen him,”
This statement no doubt alludes to the Levites’ destruction of their own fellow tribesmen following the golden calf incident (Exod 32:25–29).

and he did not acknowledge his own brothers
or know his own children,
for they kept your word,
and guarded your covenant.
10 They will teach Jacob your ordinances
and Israel your law;
they will offer incense as a pleasant odor,
and a whole offering on your altar.
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