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27. Jesus’ disciples interrupt the conversation by their return from Sychar, where they had gone to purchase food (v. 8). Their unvoiced surprise that he was talking with a Samaritan woman reflects the prejudices of the day. Some (though by no means all) Jewish thought held that for a rabbi to talk much with a woman, even his own wife, was at best a waste of time and at worst a diversion from the study of Torah, and therefore potentially a great evil that could lead to Gehenna, hell (Pirke Aboth 1:5). Some rabbis went so far as to suggest that to provide their daughters with a knowledge of the Torah was as inappropriate as to teach them lechery, i.e. to sell them into prostitution (Mishnah Sotah 3:4; the same passage also provides the contrary view). Add to this the fact that this woman was a Samaritan (cf. notes on v. 9), and the disciples’ surprise is understandable. Jesus himself was not hostage to the sexism of his day (cf. 7:53–8:11; 11:5; Lk. 7:36–50; 8:2–3; 10:38–42).
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D.A. Carson (The Gospel according to John (The Pillar New Testament Commentary (PNTC)))