Homilies on Numbers
Origen's homiletical commentary on the Book of Numbers, cited for the tradition that Moses received both the law and its explanation on Sinai.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Homily 5 cited: tradition that Moses received the explanation of the law on Sinai and transmitted it secretly
"Origen in Homily 5 on Numbers lend their support, that Moses received on Mount Sinai from God not only the law but also the explanation of the law"