A.T. Robertson Commentary Revelation 12:13

"And when the dragon saw that he was cast down to the earth, he persecuted the woman that brought forth the man [child]." — Revelation 12:13 (ASV)

He persecuted (εδιωξεν). First aorist active participle of διωκω, to pursue, to chase, hostile pursuit here as in Mt 5:10f.; 10:23, etc. John now, after the "voice" in 10-13, returns to the narrative in verse 9. The child was caught away in verse 5, and now the woman (the true Israel on earth) is given deadly persecution. Perhaps events since A.D. 64 (burning of Rome by Nero) amply illustrated this vision, and they still do so.

Which (ητις). "Which very one."