Matthew Poole and continuators on Leviticus 23:32

32 It shall be unto you a sabbath of rest, and ye shall afflict your souls in the ninth day of the month at even, from even unto even shall ye celebrate your sabbath .

This clause seems to be added to answer an objection, how this day of atonement could be both on the tenth day, ver. 27. and on the ninth day here. The answer is, it began at the evening or close of the ninth day, and continued till the evening or close of the tenth day, and so both were true, especially if you consider, that the Jews did take in some part of the sixth days evening by way of preparation for the Sabbath, and therefore would much more take in a part of the ninth day to prepare and begin the great and solemn work of their yearly atonement. And this clause may be understood either, 1. Of this particular Sabbath called here your Sabbath in the singular number, possibly to note the difference between this and other Sabbaths: for the weekly Sabbath is oft called the Sabbath of the Lord, because that was in a special manner appointed for the praising, honouring and serving of God and celebrating his glorious works, as also the other Sabbaths here mentioned were, whereas this was principally ordained for their need and for their good, even to seek and obtain the pardon of their sins. Or 2. Of all their Sabbaths, and consequently of this. The Jews are supposed to begin every day, and consequently their Sabbaths, at the evening, in remembrance of the creation, Gen. 1. 5. as Christians generally begin their days and Sabbaths with the morning in memory of Christs Resurrection.

Marginal references: Heb. rest.