And it chanced, that a certain priest went down the same way: and seeing him, passed by.

And a certain priest happened to go down that way, and seeing him, passed on on the opposite side;

'And by a coincidence a certain priest was going down in that way, and having seen him, he passed over on the opposite side;

Now a priest happened to be going down that way, and on seeing him passed by on the other side.

And it happened that a certain priest was descending along the same way. And seeing him, he passed by.

As it chanced, a priest was going down by that road. He saw the man, but passed by on the opposite side.

By chance - Accidentally, or as it happened. It means that he did not do it with a "design" to aid the man that was wounded.
A certain priest - It is said that not less than 12,000 priests and Levites dwelt at Jericho; and as their business was at Jerusalem, of course there would be many of them constantly traveling on that road.
When he saw him - He saw him lie, but came not near him.
Passed by on the other side - On the farther side of the way. Did not turn out of his course even to come and see him.

And by chance - Κατα συγκυριαν properly means the coincidence of time and circumstance. At the time in which the poor Jew was half dead, through the wounds which he had received, a priest came where he was. So the priest's coming while the man was in that state is the coincidence marked out by the original words.
Priest and Levite are mentioned here, partly because they were the most frequent travelers on this road, and partly to show that these were the persons who, from the nature of their office, were most obliged to perform works of mercy; and from whom a person in distress had a right to expect immediate succor and comfort; and their inhuman conduct here was a flat breach of the law, Deuteronomy 22:1-4.

And by chance there came down a certain priest that way,.... Who had been at Jerusalem, to take his turn in the courses, and was now returning to Jericho, where the stationary men were, to which he belonged: for it is said (t), that
"the former prophets appointed twenty and four courses; and for every course there was a station at Jerusalem, of priests, and of Levites, and of Israelites; and when the time of the course came to go up, the priests and Levites went up to Jerusalem. The Rabbins teach, that there were twenty four courses in the land of Israel, and there were twelve at Jericho.''
And which is elsewhere (u) related thus;
"the former prophets appointed four and twenty courses, and for every course there was a station at Jerusalem, of priests, of Levites, and of Israelites; the tradition is, that four and twenty thousand were the station from Jerusalem, and half a station from Jericho; though Jericho was able to furnish out a perfect station itself; but for the sake of dividing the glory to Jerusalem, it produced but half a station.''
So that it is no wonder to hear of priests and Levites passing to and fro in this road. Nor was this a chance matter with respect to God, by whose providence all things are ordered, directed, and governed; nor any wonderful thing with respect to men, which fell out in an uncommon way, beyond expectation; the phrase only signifies, that so it came to pass:
and when he saw him, he passed by on the other side: when he saw him naked, and in such a bloody condition, he might take him for one really dead, and therefore crossed the way on purpose, lest he should any ways touch him, and be defiled by him, and so break the law, and incur the penalty of it, mentioned in Numbers 19:16 or to shun so horrible a sight; or rather, through hardness of heart, and want of compassion.
(t) T. Bab. Taanith, fol. 27. 1. (u) T. Hieros. Pesachim, fol. 30. 3. & Taanith, fol. 67. 4.

came down a . . . priest . . . and a Levite--Jericho, the second city of Judea, was a city of the priests and Levites, and thousands of them lived there. The two here mentioned are supposed, apparently, to be returning from temple duties, but they had not learnt what that meaneth, 'I will have mercy and not sacrifice' [TRENCH].
saw him--It was not inadvertently that he acted.
came and looked--a further aggravation.
passed by--although the law expressly required the opposite treatment even of the beast not only of their brethren, but of their enemy (Deuteronomy 22:4; Exodus 23:4-5; compare Isaiah 58:7).

The common translation is, by chance - Which is full of gross improprieties. For if we speak strictly, there is no such thing in the universe as either chance or fortune. A certain priest came down that way, and passed by on the other side - And both he and the Levite no doubt could find an excuse for passing over on the other side, and might perhaps gravely thank God for their own deliverance, while they left their brother bleeding to death. Is it not an emblem of many living characters, perhaps of some who bear the sacred office? O house of Levi and of Aaron, is not the day coming, when the virtues of heathens and Samaritans will rise up in judgment against you?