English: “The voice is the voice of Yaakov” — there is no effective prayer that does not contain [the power of] the seed of Yaakov; “and the hands are the hands of Esav” — there is no victorious war that does not contain [the power of] the seed of Esav.
On the daf / in context: The dual formula becomes a permanent sign: Israel’s strength is in prayer (voice), Esav’s in military force (hands).
Type of Learning
Custom (Bavli — prayer of Yaakov vs. power of Esav)
What Is Learned
Israel’s victories come through prayer (the voice of Yaakov); Esav’s power is expressed through the hand of war.