Leviticus 25:9

The jubilee signified the true liberty from our spiritual debts and slaveries, to be purchased by Christ, and to be published to the world by the sound of the gospel. The seventh month was the first month of the year for civil and worldly affairs, which were mainly concerned in the jubilee, and therefore it began in that month; and, as it seems, upon this very tenth day, when the trumpet sounded, as other feasts generally began when the trumpet sounded. In the day of atonement; a very fit time, that when they fasted and prayed for God's mercy to them in the pardon of their sins, then they might exercise their charity and kindness to men in forgiving their debts, which is the true fast, as is noted Isaiah 58:6, and to teach us that the foundation of all solid comfort and joy must be laid in bitter repentance and atonement for our sins through Christ.