Leviticus 23:32
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.
It shall be unto you a sabbath of rest,....
See Gill on "Leviticus 16:31"; and this is thought by some {q} to be the sabbath spoken of in Isaiah 58:13;
and ye shall afflict your souls; in the ninth day of the month at even; the fast was to begin at the close of the ninth day, and to continue to the end of the tenth; so Maimonides {r}: he begins to fast and afflict himself at the evening of the ninth next to the tenth; and so at the going out of it he continues in his affliction a little while of the night of the eleventh, next to the tenth, which is confirmed by what follows:
from even unto even shall ye celebrate your sabbath; which some understand of the sabbath in general; but it seems to have a particular respect to the sabbath of the day of atonement, which was to last from the evening of the ninth to the evening of the tenth day.
{q} R. Alphes, par. 1. Yom Hacippurim, c. 1. fol. 357. 2.
{r} Ut supra, (Maimon. Hilchot Shebitat Asher) c. 1. sect. 6.