Leviticus 23:32

From even to even The day of atonement began at the evening of the ninth day and continued till the evening of the tenth day. Ye shall celebrate your sabbath This particular sabbath is called your sabbath, possibly to denote the difference between this and other sabbaths; for the weekly sabbath is oft called the sabbath of the Lord. The Jews are supposed to begin every day, and consequently their sabbaths, at the evening, in remembrance of the creation, as Christians generally begin their days and sabbaths with the morning, in memory of Christ's resurrection.