English: “To lie beside her” — in this world; “to be with her” — in the World to Come. From here R’ Eliezer said: whoever commits one sin — it is bound to him like a dog.
On the daf / in context: The doubled language of the verse is split between this world and the next; sin is not a one-time event.
Type of Learning
Derash on the verse (Bavli sugya) — not a formal named middah of the 13. Parallel verbs are assigned to two worlds.
What Is Learned
A single sin of this kind ties itself to a person across this world and the next.