John Lightfoot on Matthew 19:1

[He came unto the coasts of Judea beyond Jordan.] If it were barely said, the coasts of Judea beyond Jordan, by the coasts of Judea one might understand the bounds of the Jews beyond Jordan. Nor does such a construction want its parallel in Josephus; for "Hyrcanus (saith he) built a fortification, the name of which was Tyre, between Arabia and Judea, beyond Jordan, not far from Essebonitis." But see Mark here, chapter 10:1, relating the same story with this our evangelist: He came, saith he, into the coasts of Judea, (taking a journey from Galilee,) along the country beyond Jordan.