And he must needs go through Samaria - Samaria was between Judea and Galilee. The direct and usual way was to pass through Samaria. Sometimes, however, the Jews took a circuitous route on the east side of the Jordan. See the notes at Matthew 2:22.

And he must needs go through Samaria - Or, It was necessary for him to pass through Samaria: for this plain reason, and no other, because it was the only proper road. Samaria lay northward of Judea, and between the great sea, Galilee, and Jordan; and there was therefore no going from Galilee to Jerusalem but through this province. See the note on Luke 17:11. From Jerusalem to Galilee through Samaria, according to Josephus, was three days' journey. See his own life.

And he must needs go through Samaria. Not the city, but the country of Samaria; for the way to Galilee from Judea, lay through the midst of Samaria; nor was there any other way, without going a great way about; see Luke 9:51; and which is also confirmed by Josephus (c): and this accounts for his going through Samaria, consistently with his forbidding his apostles going in the way of the Gentiles, or into any of the cities of the Samaritans; since here was a necessity for it, or otherwise he himself would not have gone, where he forbid his disciples; though the prohibition may be understood, not of barely going into a Samaritan city; for it was lawful for them, notwithstanding that, to go into one of them, as appears from John 4:8; but of going to preach there, Matthew 10:5. And besides this necessity, there was another thing that lay upon him, and obliged him to take this tour, and that is, the calling and conversion of a certain woman, and other Samaritans, whom the Father had given to him, and he was to redeem by his blood; and the time of whose effectual calling was now come; and therefore he must needs go this way, and at this particular time. The Arabic and Persic versions represent it, as a purpose and determination in his mind to go this way.
(c) Antiqu. Jude. 50:20. c 5. & in vita sua, p. 1019.

There was great hatred between the Samaritans and the Jews. Christ's road from Judea to Galilee lay through Samaria. We should not go into places of temptation but when we needs must; and then must not dwell in them, but hasten through them. We have here our Lord Jesus under the common fatigue of travellers. Thus we see that he was truly a man. Toil came in with sin; therefore Christ, having made himself a curse for us, submitted to it. Also, he was a poor man, and went all his journeys on foot. Being wearied, he sat thus on the well; he had no couch to rest upon. He sat thus, as people wearied with travelling sit. Surely, we ought readily to submit to be like the Son of God in such things as these. Christ asked a woman for water. She was surprised because he did not show the anger of his own nation against the Samaritans. Moderate men of all sides are men wondered at. Christ took the occasion to teach her Divine things: he converted this woman, by showing her ignorance and sinfulness, and her need of a Saviour. By this living water is meant the Spirit. Under this comparison the blessing of the Messiah had been promised in the Old Testament. The graces of the Spirit, and his comforts, satisfy the thirsting soul, that knows its own nature and necessity. What Jesus spake figuratively, she took literally. Christ shows that the water of Jacob's well yielded a very short satisfaction. Of whatever waters of comfort we drink, we shall thirst again. But whoever partakes of the Spirit of grace, and the comforts of the gospel, shall never want that which will abundantly satisfy his soul. Carnal hearts look no higher than carnal ends. Give it me, saith she, not that I may have everlasting life, which Christ proposed, but that I come not hither to draw. The carnal mind is very ingenious in shifting off convictions, and keeping them from fastening. But how closely our Lord Jesus brings home the conviction to her conscience! He severely reproved her present state of life. The woman acknowledged Christ to be a prophet. The power of his word in searching the heart, and convincing the conscience of secret things, is a proof of Divine authority. It should cool our contests, to think that the things we are striving about are passing away. The object of worship will continue still the same, God, as a Father; but an end shall be put to all differences about the place of worship. Reason teaches us to consult decency and convenience in the places of our worship; but religion gives no preference to one place above another, in respect of holiness and approval with God. The Jews were certainly in the right. Those who by the Scriptures have obtained some knowledge of God, know whom they worship. The word of salvation was of the Jews. It came to other nations through them. Christ justly preferred the Jewish worship before the Samaritan, yet here he speaks of the former as soon to be done away. God was about to be revealed as the Father of all believers in every nation. The spirit or the soul of man, as influenced by the Holy Spirit, must worship God, and have communion with him. Spiritual affections, as shown in fervent prayers, supplications, and thanksgivings, form the worship of an upright heart, in which God delights and is glorified. The woman was disposed to leave the matter undecided, till the coming of the Messiah. But Christ told her, I that speak to thee, am He. She was an alien and a hostile Samaritan, merely speaking to her was thought to disgrace our Lord Jesus. Yet to this woman did our Lord reveal himself more fully than as yet he had done to any of his disciples. No past sins can bar our acceptance with him, if we humble ourselves before him, believing in him as the Christ, the Saviour of the world.

must needs go through Samaria--for a geographical reason, no doubt, as it lay straight in his way, but certainly not without a higher design.

He must needs go through Samaria. Because it lay right between Judea and Galilee.

And he must needs go through Samaria - The road lying directly through it.