A.T. Robertson Commentary Luke 10:36

"Which of these three, thinkest thou, proved neighbor unto him that fell among the robbers?" — Luke 10:36 (ASV)

Proved neighbour to him that fell (πλησιον γεγονενα του εμπεσοντος). Second perfect infinitive of γινομα and second aorist active participle of εμπιπτω. Objective genitive, became neighbour to the one, etc. Jesus has changed the lawyer's standpoint and has put it up to him to decide which of "these three" (τουτων των τριων, priest, Levite, Samaritan) acted like a neighbour to the wounded man.