And many of the Samaritans of that city believed on him for the saying of the woman, who testified, He told me all that ever I did.
All Commentaries on John 4:39 Go To John 4
Augustine of Hippo
AD 430
So then they knew Christ first by report of another, afterwards by His own presence; which is still the case of those that are without the fold, and not yet Christians. Christ is announced to them by some charitable Christians, by the report of the woman, i.e. the Church; they come to Christ, they believe on Him, through the instrumentality of that woman; He stays with them two days, i.e. gives them two precepts of charity. And thenceforth their belief is stronger. They believe that He is indeed the Savior of the world.