Then I contended with the nobles of Judah, and said unto them, What evil thing is this that ye do, and profane the sabbath day?

Wesley's Notes

13:17 Nobles - Their chief men and rulers; whom he charges with this sin, because though others did it, it was by their countenance or connivance: probably too by their example. If the nobles allowed themselves in recreations, in idle visits and idle talk on the sabbath day, the men of business would profane it by their worldly employments, as the more justifiable of the two.

Matthew Henry's Concise Commentary

13:15-22 The keeping holy the Lord's day forms an important object for their attention who would promote true godliness. Religion never prospers while sabbaths are trodden under foot. No wonder there was a general decay of religion, and corruption of manners among the Jews, when they forsook the sanctuary and profaned the sabbath. Those little consider what an evil they do, who profane the sabbath. We must answer for the sins others are led to commit by our example. Nehemiah charges it on them as an evil thing, for so it is, proceeding from contempt of God and our own souls. He shows that sabbath-breaking was one of the sins for which God had brought judgments upon them; and if they did not take warning, but returned to the same sins again, they had to expect further judgments. The courage, zeal, and prudence of Nehemiah in this matter, are recorded for us to do likewise; and we have reason to think, that the cure he wrought was lasting. He felt and confessed himself a sinner, who could demand nothing from God as justice, when he thus cried unto him for mercy.