John Lightfoot on John 4:6

[Now Jacob's well was there.] Of this well doth Jacob seem to speak in those last words of his about Joseph, Genesis 49:22: "Joseph is a fruitful bough, even a fruitful bough by a well." For Joseph's offspring increased to a kingdom in Jeroboam, and that in Sychem, hard by Jacob's well...

[He sat thus.] He sat thus, as one wearied. The evangelist would let us know that Christ did not seemingly, or for fashion's sake, beg water of the Samaritan woman, but in good earnest, being urged to it by thirst and weariness. So 1 Kings 2:7; "Shew kindness to the sons of Barzillai," for so, that is, in a great deal of kindness, they came to me. Acts 7:8, "He gave him the covenant of circumcision," and so [being circumcised] "he begat Isaac."