We formulate and prove internal versions of the Yoneda lemma and of the Yoneda embedding theorem in a finitely complete, locally Cartesian closed ∞-category C: for every object X∈C and every universe U classifying the diagonal of X
Nearby in the stack
, the Yoneda map
YX:X→UX
is a monomorphism. The proof uses only finite limits, dependent products and universes, and does not rely on the external Yoneda lemma. The result applies notably to every elementary
∞
-topos, where it recovers a theorem of Rasekh [Ras18].