Mark 9:7 → Deuteronomy 18:15

At the Transfiguration the cloud envelops the disciples and the Father speaks: "This is My beloved Son. Listen to Him!" (Mark 9:7). The closing command reproduces the two words of LXX Deuteronomy 18:15 — αὐτοῦ ἀκούσεσθε, "him you shall hear" — the pivot of Moses's promise: "The LORD your God will raise up for you a prophet like me from among your brothers. You must listen to him." Luke 9:35 preserves the LXX's pronoun-first order exactly (αὐτοῦ ἀκούετε), and Mark's received text-form carries the same order (critical editions print ἀκούετε αὐτοῦ, with Matthew); in every form the echo is secure, because the Father takes up Moses's own verb and pronoun. The prosopological grammar is what makes this allusion categorical: the Father himself quotes Moses — in the presence of Moses (vv. 4-5) — to authorize the Son, closing Moses's open-ended promise ("a prophet…") on a named person standing on the mountain. Mark's narrative setting sharpens the point. Peter has just proposed three shelters, one each for Jesus, Moses, and Elijah (v. 5) — three voices, level with one another — and the cloud-voice corrects him: not one prophet among the prophets, but the Son to whom Law and Prophets alike defer. The command also lands on Mark's immediate context: it ratifies the suffering-Son teaching Peter had rebuked (8:31-33) — listening to him now means receiving a crucified Messiah. This pair scopes the Deuteronomy 18:15 strand of the composite utterance; the royal-sonship strand ("This is My Son") belongs to Mark 9:7 → Ps 2:7. The telos: at Horeb the people begged never to hear the divine voice again, and God called that request well spoken and promised a mediator; here the voice from the cloud is Horeb answered — the word Israel could not bear now comes through a beloved Son whom the disciples can look at and live, so that "Listen to Him" is not a burden but the opening of the only safe door to God.