Then said the woman of Samaria unto him, How is it that you, being a Jew, ask drink of me, who am a woman of Samaria? for the Jews have no dealings with the Samaritans.
All Commentaries on John 4:9 Go To John 4
Cornelius a Lapide
AD 1637
The woman therefore saith, &c. Therefore in Greek and Hebrew often merely marks the beginning of a sentence. Here, however, it denotes an inference from the preceding question of Christ.
Jesus had asked the woman for water; the woman therefore replied to His question, How is it, &c. The woman recognised Jesus to be a Jew from His dress and speech, which Christ, out of good feeling to His country, accommodated to that of his fellow-countrymen.
For the Jews, &c, i.e, have no intercourse, do not use the same bed, or cup, or vessel, as though they were impure and abominable on account of their schism. These words may be either those of the Evangelist, or of the Samaritan woman. In either case they are very appropriate. Learn from this example how we ought to shun the friendship, looks, and conversation of heretics; for "their speech doth eat as doth a cancer," saith S. Paul.